If anything happens to him (ie If he has an accident), let me know.
万一他有什麽不测，就请通知我。
He is, if anything, a little weaker today.
他今天身体反而比较弱一点。
If anything should occur, ...
如果发生什么事情的话，
Always at the back of the wife's mind, though probably not consciously, is the knowledge that if anything happens to the husband she will have to manage on her own.
