Problems with a mother-in-law

[Darkic]

I wonder what is correct: my mother's-in-law name is ... or my mother-in-law's name is ...
Please help.
Thanks

[Kait]

The latter is correct

[josh_nippon]

The only time you would use the 's' on mother is the plural, such as mothers-in-law or likewise attorneys general, or sergeants major.

[JaneP]

It is 'mothers'-in-law if you want to talk about more than one mother-in-law i.e. there are several mothers-in-law here today. If it is a question of posession then you would use mother-in-law's, i.e my mother-in-law's dress.

[matilda]

i think mother in low never takes S , even if it wants to mention s.th that belongs to a mother in law

[JaneP]

Then how would you denote the plural or possesive? Being an English noun it has to undergo the English inflection for these things: My mother-in-law's party; All the mothers-in-law in the world.

[Sebaylias]

quite right jane.

mother-in-law singular
mothers-in-law plural (though most people would write/say mother-in-laws)
mothers-in-law's plural possessive
mother-in-law's singular possessive