I've name changed as this could be outing.
DH is still fairly close with his ex's family. They're all in regular conversation, came to our wedding and still very fond of DH. DH is cordial with his ex, they had a clean break after she broke up with him a few years ago but she has made herself scarce the last year or so when he's met up with her family. I've never met her but met her family a few times of which they welcomed me in with open arms.
After a very short illness DH former SIL has passed away. It's devastating as she really was a one-in-a-million type of person, DH is devastated. The family has kept DH in the loop the whole illness; he is still like a son to them. He views SIL as the sister he never had; SIL viewed DH the same.
We've just been given the funeral details by ex PIL. It's a couple of hours away and our baby is EBF on top of would it be imposing on ex-gf baring in mind i've never met her before. But on the other hand, DH is devastated and I hate the idea of him having to do the day alone. Obviously ex-gf grief/comfort of the day comes first but what shall we do?