1) Huyo MIL akwende kwa bwana wake, hiyo ni nyumba ya watu wengine. Ask your friend to her her mother to stay away.
2) Huyo bwana should avoid the MIL and anything to do with her kabisaaaa....she will know that her constant advice and presence is not wanted at all and start behaving. Hata "ninakuja kusalamia wajukuu weekend" should be discouraged absolutely!!!
3) Huyo bwana should (and must) not implement anything coming from her wife for now (untill 2 above is achieved) coz probably it will be MILs idea.
That, brothers and sisters is the only language MILs understand, irrespective of which side the MIL comes from. I know coz I have experienced it work twice with two of my closest friends so successfully. And today those MILs respect them very much. Anything else is half business!!
When I have money, I get rid of it quickly, lest it find a way into my heart.