DH's x wife is demanding that we pay money for his son who is 17 and has just started to do his A-levels in school, do we have to give her the money, it's not that we don't support his dc's but we preffer to give them the money or buy them the things that they need rather than give her the money. she only has a part time job and a house she can't afford without our help, she has been advised to sell the house and go out to work full time, weather she does or not remains to be seen ,but legally do we have to give her the money and if so how much is it?