Is this weird?

My fiancé gets his son once a week and when he gets him he takes him to his uncles house instead of coming to mine with our child. (We are working on our living situation currently.) I feel like he’s living a different life. He has another child that’s not in mine or my sons life and the times he does come around( maybe once every couple of months) he is rude to me. What do you guys think?

I talked to him this morning and he said his son who is 9 is not comfortable here so he takes him to his uncles for the 6 hours he has him. I get he’s a kid and this is very difficult for him but I am finding it to be very manipulative. He tells his dad that he should be able to take our 6 month old there without me around. And my fiancé tells him that he’s in the middle of getting THEM a place. He says to him can we invite (me) over to hangout with them. Like WHAT. what is this teaching his son? Am I crazy for being pissed about this. What about me and his other son.