1) When father was alive n did aqk to one of his child because of going against his wish, so after his death will that child get his share (as per sharia) in father's property?

2) If the father was not in good term with his relative when he was alive , should the children also be away from those people or should they get along with them and keep a good relationship with them?

1- Yes.
2- No. They should not be a way. Children should keep a good relationship