I'm (25M) not a fan of my wife (25F) breastfeeding in front of my brother (27M) and I'm jealous

For me (25) personally, I don't like it when my wife (25) breastfeeds in front of my brother (27). She has done this plenty of times, I have nothing against her breastfeeding in public if she chooses but I draw the line when it comes to me having my brother & his daughters (4 year old twins) over. It's not because I'm concerned for their comfort over hers, I just don't want my brother sexualizing her when she's doing something necessary like feeding my son. Here's the thing though: My brother has never sexualized my wife. He's known her for years and helped her so much during her pregnancy when I had to go work.

He also helped the both of us get a great affordable apartment for our family, right next to him so he can continue helping us. I'll admit, my brother definitely has done so much to help my family, and I'll forever appreciate him for that. My wife also loves my brother's daughters, so she's happy she gets to spend so much time with them. While he's never sexualized/disrespected my wife, I don't know why I feel the way I feel. Maybe it's jealousy?

I'm not saying he sexualizes her but let's face it, the possibility is very high if she has her boobs out. She already gets a lot of compliments and attention with everyone telling her how good she looks after having a child. A few went as far as to calling her a milf. Plus she's a busty woman, which also adds to why I feel the way I feel. There's been times when she's done breastfeeding, she puts our son to the side and her breast are completely exposed in front of my brother. Of course she quickly fixes her shirt afterwards to cover herself, but the fact that both of them are insanely comfortable like that at times is so alarming to me. Again like I said, my brother has never disrespected my wife, but the fact that he's seen my wife's breasts feels a bit too much to me. My wife of course isn't flashing her breast sexually at all, it's all done respectfully as she's just innocently feeding our baby.

Here's a good example, this happened a few days ago when i invited my brother & his girls over to our place for dinner. I'm with nieces, joking with them & playing with their toys. My brother is on the other couch aside from me with my wife, they're both laughing & just chatting with each other. My wife excuses herself to get our son, but when she comes back she's already breastfeeding him. This is where I start feeling weird, because she sits right next to my brother again with our son eating & her boob out. They're just chatting like nothing is going on and I'll admit it made me feel a bit uncomfortable. It always didn't help that my nieces were so interested with my wife breastfeeding (they were never breastfed) even they gathered around her with curiosity. I'm sorry, but this all seemed so weird to me how everyone was insanely comfortable. I could understand the curiosity my nieces have, but the fact that my wife feels so comfortable & has so much trust towards my brother is quite alarming to me. Even the "he's getting so big!" compliment my brother gave my son made me feel uneasy.

I definitely feel it's me just over thinking everything, or maybe just jealousy. I DO trust my wife and brother so much, even though this post shows otherwise. I have left the two of them together alone plenty of times, especially when I have to go to work or have to do a quick errand. My wife stays home with our son & my brother works from his place (so he can also be with daughters) as an electronics technician, so they see each other all the time. He's helped her clean our place, helped her go grocery shopping & overall has helped her with anything she needs. I really don't care if they spend so much time together. Once I start getting these dumb feelings of jealousy though, I definitely start disliking them being together so much. That's when my trust level for them goes low and I wish this didn't happen. I know they won't do anything behind my back, but sometimes I fear that'll happen.

My wife has been very vocal of how appreciative she is about my brother, she's happy he's in our lives helping us. She's loves him (as family) and he loves her so much as well, but their relationship at times again: makes me jealous. I'm jealous of the strong love they have for each other, which makes me worried she's going to end up with him. And he's a single dad, so there's a possibility.  My brother calls my wife "the sister he wished he had", that's how close he is with her & he's also very protective of her and my son.

Not even sure what I should do here. Should i tell my wife and brother how I feel? Or should I simply just let it go and move on? There's many things I can do, but I'm not entirely sure what's more appropriate. I believe if I mention anything, I'll offended them & possibly ruin their relationship. I also believe I should just grow up and be mature, I know my brother is a sweet man but my jealousy isn't helping.

I know I should probably be happy there's someone out there that also cares & loves my wife, that person being my brother. I know that if something bad ever happened to me, he'll be there for her and my son. But right now, their relationship is something I really need to get used to.

TL;DR: jealous of my wife breastfeeding in front of my brother and the strong bond they have together.