musumesan
むすめさん
(someone else's) daughter
Note
[musume san]…refers to somebody else's daughter, while "musume" refers to one's own daughter.
Example
A：むすこさん、むすめさんは おいくつですか。
B：むすこは ろくさい、むすめは にさいです。
A: How old are your son and daughter?
B: My son is six and my daughter is two.