## What prompted you to do this thing? ##

"What caused you to do this?" or "Why did you do this?" What Abraham did can be stated explicitly. "Why did you tell me that Sarah is your sister?" (See: [[rc://en/ta/man/translate/figs-explicit]])

## in this place ##

"in Gerar"

## Besides, she is indeed my sister ##

"Also, it is true that Sarah is my sister" or "Also, Sarah really is my sister."

## the daughter of my father, but not the daughter of my mother ##

This can be translated as "We have the same father, but we have different mothers."