Myself and DP have one child together and one of the way. DP has 2 older children from past relationship (one in their 20's and one in mid-late teens, so neither are 'children').
Issue is DP's older kids refuse to have anything to do with our child. In all honesty, I don't know why, but what I do know is that DP has been bit of a Disney parent since splitting up with his EX (about 8 years ago) so I have noticed that at times he's little more than a cash machine, taxi driver etc to them, and often doesn't hear back from them unless they want something. I don't approve but don't get involed either! Important to point out, since my DD has been born it hasn't affected their relationship with their father at all, as I know this could totally be something that could cause resentment, if anything DP has missed out on a lot of DD's milestones so far because of time exclusively spent with other kids. Also his other kids have two siblings from their mother, who aren't their fathers children who they have a good a relationship with as they do each other. So it's not like they see "half-siblings" as a lesser.
So, AIBU to think that DP shouldn't be as laid back about is as what he is? Basically he's tried to introduce and incourage a relationship, so have both met DD but aren't interested. I know if it was a close family member of mine that I wouldn't be OK with them totally having rejected my child, but I also get they're his kids too. But should he be doing more about it?