Hello Damiloladuke, i understand ur pain clearly. Sometimes suspections make us see and make meaning out of things that clearly means nothing but in ur case, i can relate quite well.

Saying ur mum has a pet name u know well and ur husband calls out that name when he made love to u; my dear dis is no mistake, it means he has gone down with someone with dat name and possibly its ur mother. He calling her name while with u means he has done this not once or twice, and he enjoys it better than with u that is why the name and pleasure stuck in his head. This is something that happens with some persons.

My advice to u: I believe u should first talk to him about it, put up that boldness (u definately need it), dont play innocent face when speak to him about it or else he'd take advantage of your expression. Give it a straight face expression but dont go berserk in any way.

Also, u can look for other ways to spice up ur marriage; putin more effort, try to be naughty in bed with him, try out things u have never done which he might love; if u cant give some men sex d way they want then they could cheat. Also, try to spend time with him; try going out with him, show more love. Our businesses can ruin marriage so be careful to create time for ur man...

If things are gettin worse and u have more prove he has been laying with ur mum, then u have to divorce him (optional). Adultery is a certified reason for divorce, its even worse when u find ur man laying with ur mum, dats an abomination... No man has the right to treat a woman like that, and deprive her of what belongs to her. No way, so do something... God bless ur marriage

u can lie for Africa, Man no fit do dat kind mistake,If he lyk sleep with d whole word if him comes to d oda room him go comport.
u didn't even say 1ce.sumtyms i wonder don't pipu use to think deeply before lying.
shey u think say everybody wey dey here na im be ajebutter

Its possible,some highly experienced/beautiful and finally lonely single mum could do that.
Your mum could have sex with him reckless abandon while you as many stupid wives do, is doing it half heartedly and while doing it pressuring him to obtain from him which is a major put off.LADY CHECK YOURSELF!