FH's family invited FSIL when FH doesn't want to invite her. They have reached out to me and told me that I need to send her an invitation. I think we should invite her but I don't want to go against FH wishes. The details make it a tricky decision.
FH and FSIL have almost no relationship (did not invite us to her recent wedding).
She is dying of cancer (but will likely be well enough to make it to the wedding).
Her son will be attending because he's moving here to live with the family.
We are already at capacity and would have to take someone off of our original list.
What would you do?