en_tn/gen/26/15.md

in the days of Abraham his father

The phrase "in the days of" refers to the time when a person was alive. This could be translated as "when Abraham, his father, was living." (See: rc://en/ta/man/translate/figs-idiom)

much mightier than we

"much stronger than we are"

So Isaac departed

"So Isaac and his household left." Only Issac is mentioned because he is the leader, but his family and servants were with him. (See: rc://en/ta/man/translate/figs-explicit)