BIL & SIL have not see our kids (their nephews) since December 2019. We invited them for a garden Birthday tea in July, in the back garden, for our twins 2nd birthday. They said no because of Covid. They said they were not leaving the house this summer.
There would only be 7 people there including the kids but they said it was too risky. They are both vaccinated and have no underlying health issues.
We accepted their response with good grace. Today we found out that they went to the opera this week and are going on holiday next week.
YABU: their excuses are valid.
YANBU: they just don’t want to see you or your family and are making silly excuses.