Hahahah, Im sorry If this is confusing you even more. I came up with an idea to explain what I want to know: I want a question(using whatever word has the function of "whose") that can be answered with 私 の お母さん は 料理 する の が 上手 です.
The main idea of my question is to learn how to create "whose" questions without the structure "kore wa dare no X desu ka" (the one that, up to this moment ,is the only one taught) because having a mother that is good at cooking(use whatever example you find appropiate) is incompatible with the "kore structure" question.
I apologize for my confusing English, Its not my first language