回复：我是姐姐养大的，现在我要供外甥读书给姐姐买套房，老婆不同意

You should buy it. Your wife won't divorce you. You should tell your wife how important your sister is in your life. To raise a child, is more difficult than to give birth to a child. Your mother ran, never looked back to you.  You were an abandoned orphan. If with out your sister, you would not even  survive. Or at most, just could became a no body . You are doing well. Your sister is so poor. You should support your sister, to repay her as much as possible. The animals could even repay any one who loved them, saved them. We are human beings, how could just be recipients?