By no means do I want to discount the possibility of beta minor, but being that both are Chinese, both types of thal are prevalent, so testing the wife is in order if she has not already been tested. If she is beta, there is very little chance of any problems with a child, as the husband has had beta eliminated. Also, Lepore is not found in Chinese, as far as I know, so one of the main silent variant beta mutations is also eliminated. By the way, if one parent is beta and the other an alpha carrier, it poses no risk to children.