After not meeting DSD's maternal family in all the time that I've known her (6+ years), largely driven by her grandparents refusing to accept that DH moved on after her DM (their DD) died when she was a young child, some relatives have now decided they want to meet me. They've asked to come to our house and DH has arranged the first date we are all free.
For context, DSD and I have a great relationship now and I treat her like my own DD but in the early years it was complicated as she couldn't understand why her other family and I were entirely separate. It's only as she has got older age has she realised that it was their choice and she and I now have a strong bond.
DH doesn't understand why I'm upset that after being shut out for years I am not only expected to have to meet them but to host as well. I will do it for DSD but it is not the start of a great relationship when it's taken so long and he is defending them about it. I feel they've let DSD down as this could have happened years ago and saved the poor girl a lot of sadness.
YANBU - it's reasonable that you are upset and DH should be more sensitive to this
YABU - they've done nothing wrong and are within their rights to invite themselves