They are teenagers now but they have always been unfriendly and very spoilt, right from when they were kids. Their parents are separated and I think that has made them even more spoilt. Both sets of grandparents shower them with gifts, let them get away with anything and compete for their approval. Anyway these kids have never said thank you (to me) for birthday and Xmas presents, they never greet me but purposefully turn their backs and walk out of the room if I come to visit, that sort of thing. I know in some respects they are typical teenagers but I still feel very hurt by their behaviour and now I've just given up. I feel a bit sad that I can't have a relationship with them (I have no children of my own) and I feel like it's my fault, like I should have tried harder to make them like me, but I also feel a bit confused / resentful because I don't think it's right for adults to pander to spoilt children to try to win their affection. I know raising children is very difficult but I also feel like my brother and his ex wife could have done a bit more to try to teach them some manners (these kids never get told off or reprimanded, they basically do whatever they like). Am I unreasonable for feeling this way?