Whose flowers are these?
His flowers
Whose car/cap...is it?
His car/glasses/cap
Whose father/son is it?
His father/his son
Whose ice cream is it?
His ice cream
Whose bags are these?
Her bags
Whose magic wand/dress/tiara is it?
Her magic wand/dress/tiara
Whose car is it?
Her car
Whose mother/daughter is it?
Her mother/her daughter
Wose watermelon is it?
Her watermelon
Whose bike is it?
His bike