I'm at my mums for Sunday lunch and sister is here with niece who is 6. My sister has let her bring her roller skates and use them in the kitchen whilst dinner is cooking and she has crashed into the dinner table and knocked a whole up of fizzy drink all over me. I now have to borrow my mums clothes or sit and eat my dinner in soaking wet clothes. She hasn't even apologised. I think she's shows a lack of respect for me or my mums home. My mum has glared at me as if to say shut up and don't say anything.