My fiancée and I live together and his mother has been complaining that she is lonely and bored. She now wants to come stay with us for 3 weeks. she has entirely too much time on her hands and nothing to do.

I also work from home while my fiancée works in the office. He doesn’t even plan to take any days off from work while his mother is here. We don’t have any children so it’s not like we need her help around the house. And I don’t want to be stuck in the house with his mother for 14+ days

AITH for not wanting her here that long?

How can I tell my fiancée no without sounding harsh?