First I think your mother was wrong to say that you are ugly. For a start it is unhelpful even if true - what can you do about it, and your looks are in your genes so either she or your father must have been responsible for them to an extent. It is very unusual to ever tell another human being about their looks, good bad or indifferent. It is a very personal thing. Once you are in love with someone you may tell them how great they are and how good they look. I would say you are above averagely good looking for anybody that you are not in love with to make remarks about your looks. If they say you are good looking they are not likely to be lying, in which case I can only conclude that maybe your mother said you were ugly as she was trying to stop you realising that you were better looking than your brothers.