YOU SAID:

I went to my aunt's place and found my dad in her bed.

INTO JAPANESE

私は叔母の家に行くと、叔母のベッドで父を見つけました。

BACK INTO ENGLISH

I went to my aunt's house and found my father in her bed.

INTO JAPANESE

私は叔母の家に行くと、叔母のベッドに父がいました。

BACK INTO ENGLISH

When I went to my aunt's house, my father was in her bed.

INTO JAPANESE

私が叔母の家に行ったとき、父は叔母のベッドにいました。

BACK INTO ENGLISH

When I went to my aunt's house, my father was in her bed.