http://revach.net/article.php?id=4815

Section: Parshas HaShavua   Category: Quick Vort
Pashas Vayetzei: Rav Meir Shapiro - Yaakov Consults With His Wives

Hashem told Yaakov it is time to leave Lavan's house and go back to Eretz Yisrael. Instead of picking up and going, Yaakov first consults with Rochel and Leah. And if they had said, "No!" would Yaakov not listen to Hashem? Moreover, their answer of, "Halo Nochrios Nechshavnu," seems irrelevant.

Rav Meir Shapiro answers as follows. "Everyone asks how could Yaakov marry two sisters if he kept the whole Torah? The Rashba and Ramban answer that he only kept the entire Torah in Eretz Yisrael and not in Chutz LaAretz. Others say that since Rochel and Leah were considered Geirim and a Ger is like a newborn losing all previous family relationships, therefore, they were not halachically sisters."

After Hashem told Yaakov to go to Eretz Yisrael, he called his wives since he felt this impacted them directly, as he would not be able to remain married to both of them. Their answer was, "Halo Nochrios Nechshavnu;  We are considered like Geirim and are not related so there is no problem."