Legally appointing godparents

I'm looking for info online and it's very unclear. Maybe some of you people know. My wife and I are going on a 10-day trip to Ukraine next week. Our daughter is 13 months now and she's going to spend half the time with my wife's mom and half with my mom. She's doing fantastic - running around, happy all the time, babbling, talking with her hands, climbing on everything, not scared of anything, not anxious, securely attached, already saying a couple words in two languages, super fucking strong. She has fucking traps and delts and hella quads. I'm not joking. She's got that hybrid vigor. She grabs my fingers, pulls herself up into a chinup position, and holds it for like 5 seconds. She likes to dance and eat eggs out of my plate even when she has her own right in front of her and she's very sarcastic.

I am terrified of flying. Every time I get on a plane, a big part of me is convinced it's going to break up on takeoff or landing. I think it has to do with my experience immigrating to America, but I hate everything about airplanes. So now, I'm thinking about contingency plans for what if we both die. What happens to my dughter?

My question: How do we make it so legal guardianship goes to a specific person in the event of our death? And then, how do I make it so my daughter gets all the money from my substantial life insurance policy? That money should be enough to get her to 18 and probably through college.

We want legal guardianship to go to my wife's brother. The thing is, he's only 23 and he's not married yet. But he's one of the smartest and most responsible people I know. He's a CPA/CFA and works in ER, so she shouldn't be a financial burden between the life insurance and his income. He's in a relationship and I don't see him not being in one in the future. With his personality, he'd make a great dad. And he already spends a lot of time with her and clearly loves her a lot.

I assume that if there's nothing in writing, this kind of shit ends up in court or in front of some board. And they probably look at the situation and make a determination of what they think is best for the kid. If they look at our situation, they'll see that I have an older sister who's been married for a while and they're both highly successful by conventional Western standards in the financial sense and present a picture of a happy family. But they are not a happy family. I need to make sure they will have no legal claim on my daughter if anything ever happens to us despite appearing to be the most qualified candidates to the outside observer. And they would love to adopt my daughter for their bratty, overmedicated children to engulf. I also don't want my mother to have any legal rights to her. They can still have a relationship if my daughter wants one with them, but no legal rights.

What kind of documents do I need for this? What kind of attorney handles this kind of shit?