Massive backstory but I will try and summarise.
My mum died when I was a teen. My dad moved on immediately. He was consumed by his new DP's family and spent all his time with them. We got thrown the occasional fish but missed out on holidays, Christmases etc. He hardly knows my DC. His DP didn't want to know us as she had DC of her own and she regularly badmouthed us to my Dad.
Now my dad is alone again as his DP passed away. We thought we would get our dad back, but it is the complete opposite. We get all the hard yards to deal with e.g. the ailments, the loneliness, the grief, etc. and I know for a fact they don't as I hear them on the phone and it is all positive and fun. He has been spending Christmas and Easter etc, with them and their families, rather than his own DC and DGC but has said this year he will be with us, the first time in decades.
What has got to me now though is something he has said to me which I find really hurtful. He has told me that when he passes away he doesn't know who he wants to be with in the afterlife, them or us. I know this is all pie in the sky but I just find this really, really hurtful and I find it massively insulting to my mother. He and his DP were not married, didn't have kids and I just find it really hurtful. I am really stressed out at the moment and have some health issues and I really think that I haven't had much support in my life as I lost my mum very suddenly and within weeks I lost my Dad and then my extended wd family as my mum's lot and her friends refused to speak to him when he moved on so quickly.
I just don't know what to do. He is elderly now and I don't want to upset him, but I feel like I have had to put up with an unbelievable amount of crap from him (and his DP) and I feel like a 2nd class citizen. Your parents aren't meant to make you cry and feel shit. I certainly wouldn't treat my DC like that.