Space Marriage & Space Children?

Dear God, no. Kids tend to be obnoxious, even in fiction, and I fail to see the point of marriage. It is just an obsolete ritual surviving through sheer cultural inertia. It wouldn't make any sense and it would add nothing to the story.

You mean, make use of the tactics the quarians used in ME3?

Properly done this could be cool. I would enjoy it.
However, let's be honest here. With craptastic places like russia and the likes of them outright banning the game if it has something like gay marriage (especially between men), Bioware will not do it. They have to consider the most sales and bla bla. And considering how things are "evolving" lately (I'm talking about the surge in stupidity and ignorance all over the planet lol), pushing the boundaries even a little bit, by adding the word "marriage" *GASP* between two men, is not a risk Bioware will take, in my opinion.
Like I said I would love to rp that, but eh, it is what it is. A marriage/happy ending in ME3 would have been great too. I think for the 2nd time ever I might get a mod for it haha... (1st time was with DAO, when I got Roland romance mod... which... was absolutely amazing - the voice acting, the story, the dialogue... far FAR better than Zevran romance)

They already had a gay marriage in ME3 of sorts. Granted, one husband had died, but still I think that leaves the option open for Andromeda.

Still, I think they'd be okay with it.  In DAI, the only time I married was when using the Cullen mod.  Based on research, only Cullen (an opposite sex partner for females) and Sera (a same sex partner for females) can marry the Inquisitor.  So BioWare isn't opposed to same sex marriage.  

I'm never against anything that I can opt out of, so sure.

Or take the Fallout 1 route and have the farmer's father force you to get married.

I would personally prefer no marriage in the main game. As part of a later DLC? Sure. But I think we'll probably be a bit busy for a wedding during the game itself.

I was thinking marriage would be a thing that would come toward the end of the game.  Given that family is already a thing in MEA, it's feasible that they could continue on that route.

Eh...no to kids and here's why.

I think the idea is to see an on-screen wedding, which hasn't happened in the ME series. It never happened at all until DA:I. And that's fine by me. In fact, I love this idea. I tried the Cullen romance and while it'll never be my favorite, the wedding was very sweet. It was a nice moment before things went to hell in the DLC.  I would have liked to see a continuation of that.  For example, having Garrus and Shepard having an on-screen wedding just before the SM in ME2. Then come ME3 we could see how they've turned out. Frankly, the devs wouldn't have to change a thing except a couple of lines during the shooting scene.

Before I'd want my PC to have kids, I'd rather just see kids in the games period. We don't see any little kids running around in any BioWare game unless they are revelant to the story in some fashion. It could be something as small as Tabitha from ME1 (sniffle) to something as big (and ultimately meaningless) as the Old God Baby from DA:O.

I have seen one a kid as an NPC since DA:A and I've never seen one in Mass Effect. Besides, the only two plot relevant kids from BioWare games since 2008 was Conner from DA:O. He's possessed, raising the undead and can be killed off by the Warden. The other is Morrigan's son, who either becomes a normal child or doesn't exist at all.

Also, the writers wouldn't be able to resist putting the kid in danger for the sake of drama. I hate it when movies shoehorn that in and I would not like it here.  The little boy from the beginning of ME3 jumps to mind. I have nothing but the utmost respect for the ME team, but they can have trouble with drama without trying to get a PC's kid involved. Some of their stories get downright cheesy and eyerolling. I would rather have them stick to their strengths and not drag children into their stories.   

That's actually a super fair point that I didn't think up of.

When I discuss kids, I was thinking more in the context of like "Wow! We have an epilogue and we are happily settled on this colony, Ryder has retired, and Ryder + LI has adopted / had kids! Yay!"

And, it would be optional for the player to decide, like maybe before endgame their LI will say, "Hey honey! Would you like to have kids if we aren't blown up in this final fight!"
and Ryder can be like "Yes! I would love to!" or "No! I hate that idea!" and that would determine the course of the epilogue.

I would most certainly not want them put in harm's way. And you're 100% right, Bioware would use kids as leverage to make some more drama. A girl can dream though, right?

If we had a female Salarian as an LI, children would be something that would have to be addressed, right? Like, Salarians lay eggs once a year for political reasons. That'd come up. Even for a male Salarian, but, less so.

Furthermore, won't a lot of the people aboard the coloney ships be concerned with breeding? I didn't think about it before, but, children might actually play a big role in some of the romances. Huh.