Are these red flags?

So my boyfriends brother is kind of an awkward guy in general. But my boyfriend and i have noticed that he says weird things that are off and we genuinely dont know if its normal or not. My daughter is 22 months old by the way. Whenever she would have her legs open while sitting down or whatever, he would always say "gross, close your legs" or this one time my boyfriend said he was giving her a bath and our daughter was screaming for fun, but it was too loud so my boyfriend told her to quiet down and stop screaming. His brother then said "ew gross." Another instance was when she was dancing around and her uncle, my boyfriends brother asked her if she could twerk. It was really weird for me to hear that. Today, we were all hanging out and saying words so my daughter could repeat after us. I was changing my 3 month old sons diaper and her uncle asked her to say penis and idk it was just strange. I mean, i have been teaching her to call body parts by their names and not nicknames such as winky, cookie, no no square, etc because god forbid if anything were to happen, i would want her to tell me and i want to be able to catch on rather than wonder what cookie shes talking about (does that make sense?) My boyfriend has brought it up to me twice how his brother says weird shit like that.. its as if hes sexualizing our daughter and to be honest whenever he is holding our daughter or whenever she is around him, i am always watching what he does. My daughter loves her uncle so much but its just so weird how he says those things. My own brother doesnt even say shit like that. Are we crazy to think this is off or should we actually be wary? We are so lost and just concerned for her and want to protect her. I know sexual abuse happens with family members and we dont want to miss any signs at all. We feel guilty to feel this way towards his brother and are just lost. I feel like im a bad mother if these are red flags.