Vayetzeh: Yaakov’s Daughters

Yaakov had 12 sons and one daughter. According to one opinion each of his children was born with a twin sister with the exception of Yosef and Dinah [Pirkei D’Rebbi Eliezer Ch. 36].

Question: So, in total, how many daughters did Yaakov have?

Answer: 12 sons – Yosef= 11 sons 11 daughters + Dina = 12 daughters