Oh neat, much better than what you had earlier, congrats on continuing to write.
Oh boy, lots of characters getting introduced here. (EDIT - Actually maybe it isn't that many.) Starting right away at an important moment too, I approve. Will try to split this up and not ramble too much.
THOUGHTS
Characters
Seems the father/mother didn't get names, which isn't necessarily bad as they die right away, just know their deaths aren't super impactful because:
1. They are nameless.
2. It is hard to invest in characters you've only known for one page.
With that said I feel that by default someones parents dying is a pretty shit thing to happen, so the characters get (at least some) sympathy points.
Moving on, Tristan and Sara seem to be pretty standard main characters so far, which is fine seeing as character development takes time and there is only so much you can get across right away. However, I'll say that it is nice that you manage to still show some character traits in the opening (Tristan caring for his sister, for example). I can't really fault Sara for wanting to scream after seeing a parent die, but (unless this got changed around in some way) I thought their parents were some pretty top notch rebels, I would think they might have thought their kids some more control for high tension situations.
However, with that said, it isn't clear how old Tristan and Sara are, come to think of it they start pretty young (right?), also their parents might not be the badass warriors I was expecting, but instead they could be more political leaders for the rebellion instead. Or they might have wanted their kids to not worry about that whole side of life (for now or forever).
As you can see this is more just something to consider while you continue writing, don't necessarily have to change anything for this page.
Giovanni has an interesting name. I like how you suggest that there is a history between him and the father (and probs mother too), it might have been done in a pretty non subtle way but honestly I don't think that is a issue, it is nice to have solid exposition in the opening, but more on that later.
I do wonder if the history between them will ever be explained, considering the parents are now dead. It will be interesting to see where you take Giovanni's character, as he appears to be a major bad guy for the story at the moment. Marcus was mentioned, but hey he isn't here doing the killing.
I'll say you have lots of room to go with Giovanni, and also it is good to have a clear antagonist for the start.
Squad Five might not count as a character, but I will say that I am now wondering about the other squads, their purpose and what not. Will be interesting to see how you handle it later down the track, since at the moment all I got was that Squad Five are probably pretty good at killing (and kind of a big deal).
Setting
A peephole in a bunker? I feel that it wouldn't be that hard to spot (but I guess the bad guys might have assumed it was empty if the lights were off or something). I mean there are ways to explain it, but I just find it weird that a bunker has a small hole in it. Might be because I am imagining it is like smack bang in the middle of a wall, but it could easily be off to the side near the floor or something. Ugh I am thinking too much about this, just know that when I read it initially I found it a little weird.
I understand that the home isn't a major location and the characters will likely not be coming back, but I feel a little more description of where the action is taking place would be nice. This might just be me, so for now I'll just say to make sure you don't neglect describing locations, obviously you don't want to ruin the pacing (which is why the lack of describing the scenery here makes some sense), but if the location is important or the characters will spend a lot of time at it, make sure you help the reader imagine it the way you are imagining it.
Dialogue
Looks good to me, good to see the descriptions of the character's tone helping pretty much solidify how they are saying things. For example '“Where have you been?!” Sara asked with urgency.' is good since yeah, I can assume she is saying it with urgency, but it could be other things as well, such as with anger.
I'll close this section here since dialogue is one of the things I struggle with, but I can safely say that I feel you done a decent job with it. (With that said, maybe it could be better [there is always room to improve right?] but as it I can't point out what you should change.)
Exposition
I already know too much about the setting to not be a bit biased in regards to this section, but I feel you handled exposition well. You didn't bombard me with paragraphs upon paragraphs of info dumps, but I still feel like I know more about the world and characters. So good job, it will be interesting to see how you continue to handle this aspect of writing fiction.
Other
Also the formatting looks good to me, more clear when characters are thinking or speaking as well. Good work on that. I would like to mention, this is a sci-fi setting, so regarding this: 'Weakened by Giovanni’s blows he was easily deposed of.' Was Giovanni punching the guy (or using some other non gun weapon)? Because if yes, why? Something that can be explained later, but I'm just curious about it and feel it is worth keeping in mind as you write. (With that said, it might never be directly explained, really depends a lot on how you want to handle it and whether or not the story really needs it explained).
Also, I will say that if he was using a gun or something, you might want to replace blows with wounds or something. I feel bullets don't really classify as blows in this context, but I might be wrong.
Oh one more thing regarding dialogue, the fathers exchange with Giovanni doesn't seem to flow that well, mainly because the father goes from 'spat' to 'gently' pretty quickly. My advice regarding this is splitting the second part where the father talks into more sentences, that way the tone shift won't feel as forced. I'd go with something like:
“Marcus will fall, Giovanni, if you kill me the rebels will track you down, and they will kill you.” Tristan’s father spat.
Giovanni laughed, “You think you know everything old friend, but do you know that if I don’t kill you Marcus will kill me?”
“Run away to the rebellion then. They will take you in and protect you. I can escort you there myself, if you don’t feel safe going alone.” He said gently.
Hmm... having tried to rewrite that, I think the father spitting isn't a very good descriptor since the sentence is long. Try spitting that sentence out yourself! Doesn't necessarily need to be changed, since he could always be spitting the last part only.
Anyway, what I wrote isn't perfect, but note how there are more breaks in the last part. This sorta suggest to the reader that the tone is changing. It slows the pace down a bit which (hopefully) makes it feel more natural that the father is now trying to help Giovanni out.
I imagine there are many ways to go about showing that, I'm just going on about that part since I feel it was the weakest point of what you wrote.
I encourage you to try rewriting that exchange, think about the important parts you are trying to convey through it and try to get it across in a different way. Of course that's just my opinion, reread it yourself and see if you think that part could use changing.
With all that said, I understand that some of the things I talked about might not be very clear, or that there might be more specific things you want an opinion on, in which case just ask, then I'll try to clear it up (or offer my thoughts more specifically).
TL;DR
Massive improvement, comparing it to what you posted before. The formatting goes a long way too btw. I liked the way you handled dialogue, but I suggest looking more closely as the exchange between Giovanni and the father.
Also keep writing!
P.S.
Like an idiot I forget Tristan was talking about 'being a man now' so I guess they aren't that young, in which case my bad. Hopefully you still get something out of that part of the character section.
As I probably mentioned before, this is what I think, it is up to you to find useful things among it that'll help with your story. Some things I complain about might not matter because of [insert reason], what does matter is that you (the writer) know the reason, and if necessary, share this reason with readers at some point. ie. Why is Marcus being evil and not super nice? Because being super nice won't work! (Not a great example, but I hope you understand what I mean).