Answer:
whose
Explanation:
Who is usually used in sentences such as:
"Who broke this plate of mine?"
Who's is a contraction of WHO + IS or WHO + HAS.
"Who's looking forward for tomorrow?"
Whose is usually used when we mention something that belongs to somebody, like in this case, the uncle is only the lady's uncle.
"Whose shoes are these?"
Who is just the original form of who's.
"Who is coming to school tomorrow?"
