I’m getting a bit frustrated with my mother in law and her partner. When me and my partner met he had a 2 year old daughter and I had a 3 year old son. We now have our own little boy together. However his family have made no effort to create a bond with our son like they have with my partners daughter. They take his daughter overnight, take her on days out and to family members houses etc and do things together weekly. They come to ours to drop off my partners daughter (his ex partner will only go through them so they bring her to our house as they drive) they don’t even bother to come in sometimes to see our son. I feel like I’m trying to force them to have some sort of relationship with him. My partner said they have always been this way with her since she was a baby and always had her then and doted on her and got her everything and more she could have wished for constantly. I don’t understand what I’m doing wrong or why they don’t treat our son the same? We have previously had a bit of a discussion about it which turned into an argument but we rectified things so it wouldn’t be awkward for my partner but still there’s been no change. They only ever post their granddaughter on social media and how much they love her and spend time with her, there’s not even one single picture of our son. What can I do? Do I just call it quits and leave them to it. It’s making things intense between me and my partner at this point because of my frustration and also his.