OP, you can, of course, do what you want. However, there's a reason everyone here is telling you the same thing, and it's not just because we read it somewhere. It's because we've all been around the block.
She could be older, I guess, and sometimes women already have kids. In this instance, I think it's evidence of poor judgment on her part that she married Cancer Man, but fine.
Hopefully, you'll take
this advice, though:
Head over to Rollo Tomassi's site, therationalmale.com and read about frame, about hypergamy, about relational equity, etc. Make some time to do some learning about the journey you're heading out on.
I guarantee you
with 100% confidence that she will begin testing you as soon as you're married. It'll probably be small, at first. She'll "forget" to pack your lunch. She'll ask you to spot her $20 and then, the next day, be absolutely certain that it was a gift, not a loan. Something she used to do for you in bed while laughing and smiling will suddenly be something she expects you to treat as a big favor. She's going to be fishing around, as the hardwired instincts of all women dictate, to see how much she can get out of you before you assert yourself as the leader. She
has to, because the ancient reptile part of her brain puts her child first, ahead of you, and always will.
You will either successfully navigate her evolutionary biology (and having a six-figure income will not insulate you from this responsibility), or she will learn that you aren't worthy of respect and become the nagging, demanding, abusive wife that many other men end up saddled with while they go jerk off in the shower. If you go down that road, you, like all nice guys with failed marriages, will continue to ramp up your "generosity" until you are completely broken, never understanding why she didn't respect how hard you were trying and just kept asking for more and more, always holding out the promise that she'd finally treat you lovingly again if only you fix her car, buy a bigger house, put more money into her child's college fund, take her on that vacation to that place you secretly hate.
Your marriage will end with her screaming something to the effect of "YOU'RE JUST ANOTHER ASSHOLE LIKE MY EX-HUSBAND! WHY DON'T YOU GO BACK TO YOUR 19-YEAR-OLD WHORE!"
You face a special challenge because you're a bit of a hostage to this marriage due to your green card situation and she will absolutely know that at an intuitive level. You're committed to doing this, and that's your call. I get it. You're in love. At the very least, though, doing your homework will help you learn how to manage the situation so that you don't end up like the subject of this article:
https://therationalmale.com/2015/01/18/s...ned-on-me/
We may be having some fun at your expense, but we really are trying to help you, and you're upset about it. Do remember not to allow your wife's testing to make you upset. That's how it starts.