YOU SAID:

I was in the airport when I saw my family waiting for me

INTO JAPANESE

家族が待っているのを見て空港にいた

BACK INTO ENGLISH

I was at the airport when I saw my family waiting.

INTO JAPANESE

家族が待っているのを見て、私は空港にいた。

BACK INTO ENGLISH

I was at the airport when I saw my family waiting.