ответить на вопросы) when couples have their first-born child, they become parents and face an utterly new stage in their lives. what should parents do to be successful? what parents should not do to be successful? in their turn teenager are old enough to realise that adults are not saints any may make mistakes and that the so-called generation gap should not necessarily spoil their relation. what should good children do?

First of all I think , parents have to listen to all the advices their parents give to them.As they have an experience in bringing up,they may help to newlyweds.Secondly, as their child is growing up ,parents have to listen to his/her opinion and mustn't do from a kid a person in which they fulfill all the desires they haven't done by themselves 

Children shouldn't blame only their parents in  this "gap", everyone make mistakes and if it's a big problem , they should find a solution to it together . If you couldn't find a compromise and you think it may break your relations at all, perhaps, try to speak about it with psychologist