your mother could be the genesis of the problem dear......we men stay very far away,repeat,very far away from our mothers in-law...........so find out what started it
But also as @wendz states,this man is at fault for insulting the mom in-law...should not have done it at all!!
If you have money that you expect to start using in five years,it now belongs in stocks.
When I have money, I get rid of it quickly, lest it find a way into my heart.