Does a triple divorce take effect if a man tells his pregnant wife: "You are divorced, and the remaining two will be in front of your father," and should the wife stay in his house until her waiting period ends with childbirth, or should she not return to him?

The apparent meaning of the wording is that it is a single divorce and a promise for the rest. A promise of divorce does not constitute a divorce. The waiting period (iddah) for a woman is until she delivers her child. If her husband takes her back before the expiration of her waiting period, she must return to him.