Aunt Kay and Uncle Jamal came for a visit, and then Aunt Kay and uncle jamal took us out for dinner.

which pronoun should replace the underlined words to make the sentence less repetitive?

They

"They" should replace the underlined words to make the sentence less repetitive.

To make the sentence less repetitive, the pronoun "they" can replace "Aunt Kay and Uncle Jamal". The sentence would then be: "They came for a visit, and then they took us out for dinner."