It is the duty of a husband to house his wife, whether by renting or having it for his own. It is also his responsibility to look after his parents. The shariah teaches us a distribution of time and also financial responsibility between the two. Thus the husband may decide to build a house first for his parents, but put it on his name for not complicating inheritance later on. Then he may build his own later on. But he should house his wife in a decent renting house all the time.