Shavua Tov. Many do not realize that Lot was the brother of Sara and was both brother in-law and nephew to Avraham.
Rav Shlomo Mann זצ״ל, wrote that the Avot were teaching us to try to avoid getting into arguments and disagreements with family.
When there are differences of opinion, the two sides need to learn to speak to one another and settle the issues in a positive way.
Sometimes, when the differences are too great, it becomes necessary to separate from one another. Even if that happens, the relatives need to assure one another that they will be there for one another in times of need.
This was exactly what Avraham did with Lot. It became intolerable to live together. However, Avraham was there for his brother in-law when he was taken captive by the four kings.