I am estranged from my sister(long story).
We both have one child, her DD is four months older than my DS who is eighteen months. I have met her daughter once at a very awkward family gathering when the children were four and eight months respectively.
I am very very angry with my sister and am (on the whole) much happier now that I have nothing whatsoever to do with her. I am aware that the situation is very hard on my parents and our extended family, but unfortunately I can't do anything about that.
My mother has (passive-aggressively)made it very clear that she thinks it's a real shame for my sister's child not to have a relationship with her cousin.
In part, I know that this is because my sister's partner is an only child, so their child does not have any cousins other than my son.
I'm afraid that my POV on this is, well... tough shit. My DC has several cousins whom he sees regularly and has a lovely relationship with, so he's not missing out on experiencing that relationship. It's not my responsibility to make sure that my sister's child's emotional needs are met.
I am very aware that my mother is working up to asking if she can have my son for the weekend and have him meet his cousin.
I honestly cannot bear to see my sister or have anything to do with her, and I don't want her within a hundred feet of my child. I'm afraid that extends to her child also. (I bear my niece no malice at all, just to be clear)
AIBU to stand firm and refuse to allow my mother to orchestrate a meeting?