I completely understand OP. When we had our son, my mum was just as excited as us, it was almost like she was having another one lol (I must admit it annoyed me at times) but I knew we would always be OK as she was a great mum and will be a great support to me (son is my 1st and wasn't very maternal before), and would be an equally great nana, she had waited years for this.
And she was for just 6 months, Then she had a chest infection, which was then diagnosed as secondary breast cancer that moved to her chest and she died within 2 months, I am completely broken. My husband is amazing but I know what a support she would have been. So I always grieve what would have been.
My father comes over once a week to see us. He works long hours so can't really do any childcare, I am lucky that he loves my son so much that he would love to help but just can't.
I take my son to visit my in-laws every week as I do think family is important, but they have never offered to take my son for the night or a few hours, or come to me so I could do some jobs here while they spend time with him. (I am not resentful about that at all though, as I don't expect it and they are lovely people)
It's little things that bring it home to me, I'm not bothered about nights out ( I partied plenty before we had our son, so couldn't think of anything worse lol) when I'm ill, it is just magnified as I have no one to just come and watch him, so I can vomit in peace.
When I need my monthly bloods taking he has to come with me and wait for 2 hours while we "take a number" and wait in the waiting room.
I am however envious of people who still have their closest relative with them for support as it would be so lovely, but not envious in a horrible way, in a, that's lovely for them sort of way.
I don't however expect others really to understand just how that feels. I think Others can try and empathise but it will always be a secondary thought to them as its not their norm, and that's ok.
Sorry for long a rambling post, didn't expect it myself 😂😂