My father passed away 4 years ago and my mum (early 60's) was so distraught that I invited her to move in with my family. We didn't have a spare room so she gave us £80k to build an extension (she has the 2 rooms that we built). At the time she said it was all she could spare but that was fine as it was enough for the 2 storey extension which includes a bathroom and kitchenette. She also pays £150 p/m towards bills. She doesn't babysit or do any housework or gardening but she was a bit miserable for the first year so I didn't expect any help. But we're in year 4 now and all she does is watch TV and go shopping or meet friends. Again, I could probably deal with that but I've just found out that she gave my brother almost exactly the same amount of money (only £10k less) at the same time as she gave me. AIBU that she's living like a guest in my home while he gets to do whatever he wants with the money (he's invested it into property I believe)? I've pointed out that I feel it's unfair but she said it's her own business and if I'm unhappy, I should return the £80k and she'll get a retirement flat. She won't move in with my bro as she hates his wife!