And her husband just allows her to behave the way she does.
I don't think he would expect this behavior. If his son does tell him, divorce is probably what is going to.the straw that broke the camel's back
Screw divorce. He should put her in an institution.
True but divorce first then institution so he can find a respectable wife if he wishes.
Splendid.
I am usually fine with incest due to the amount of roleplays I have about such insane concept that my bestie and I do quite often. HOWEVER, that comment from the mother was VILE. I feel bad for the man who was trying to support his mother and then she goes and throw away all of his sacrifice and efforts to say that. He made points clear that he wanted his own family and children, valid. The mother is like "I can do it for you!"
Also, given the time period this is and how young she must have married into the family, she has a small chance of getting pregnant again. If we put aside the vileness and the fact she is his MOTHER, chances of those two producing children at her age is very low.