A Possessive adjective exercise

[Serzige]

Well, Here I come again.
I was studying about this part of speech. Then I found an exercise that was about "replacing the possessive noun" for the possessive adjective. For instance, "The dog's food is in the bowl"; then you've got to replace the possessive noun for the adjective. Like this: "His/her food is in the bowl".

Nevertheless, I stumbled with one exercise which I couldn't solve. And that exercise goes like this, "My mother-in-law's house is in London". So, what possessive adjective can replace the possessive noun? Hmmm?
Thanks in advance.
_________________
Sergio M.
"Life is too short to grieve in sorrow"

[Mister Micawber]

.
Her house is in London.
.
_________________
Native English teacher at Mister Micawber's

[Serzige]

Thanks Sir! However, Where the possessive "My" goes?? Hmmm...? Of it is impossible to show in that sentence that My mother-in-law has a house in London. Hmmm? :?
_________________
Sergio M.
"Life is too short to grieve in sorrow"

[Mister Micawber]

.
No 'my' here. That's who 'she' is: my mother-in-law.
.
_________________
Native English teacher at Mister Micawber's