My BF and I moved back into his family home. Both of his parents were 100% okay with this and were very excited to have him home (were living with them for the next years while my BF goes to school). We have our own room but share a bathroom with his teen sister who has a newborn.

The problem is that his sister absolutely hates when I clean up the family home. I love to clean, so I have no problem sweeping, mopping, doing laundry, washing dishes, etc. Whenever I clean, I always ask permission to enter a room (especially when washing clothes) and so far no other family member has an issue (4 members in total). His mother finds is such a relief that I help out and has expressed how much she appreciates it. However, his sister gives so much attitude when she comes home and notices how clean it is, especially the common area and bathroom we share. I always make sure to not clean our shared spaces (the downstairs) when she’s home, but somehow it still bothers her that I clean the house in general...

Should I stop helping clean the whole home? I don’t know what to do because it doesn’t make sense to not clean shares spaces, especially the bathroom. Maybe speak with her mom?