Where are tin plates found at home?

I don't understand the question.

Does your mother bake? She may have a few pie tins.

Possibly if your family has an old tin-type pie plate. A lot of metal stuff is made of stainless steel these days, so it may be difficult to find something made of tin.

Tin pie plate:



Edit:
Oh, I see Ceili has already suggested a pie plate.

Good luck with it!