1st daughter, 大女儿 = 老大。 2nd daughter, 二女儿 （If there are only 2 daughers, the second one could be called 小女儿. If they say 二女儿，maybe they have the 3rd kid).

there are four people in my family , father ,mother, elder sister and me . so me is :二女儿 the second daughter

yes，you’re right.

是的