YOU SAID:

my Sister and my dad made out in the bed

INTO JAPANESE

私の姉と私のお父さんは、ベッドで作られました。

BACK INTO ENGLISH

My sister and my dad was made on the bed.

INTO JAPANESE

ベッドの上は私の姉と私の父がしました。

BACK INTO ENGLISH

My sister and my dad was on the bed.

INTO JAPANESE

私の姉妹および私のお父さんは、ベッドの上だった。

BACK INTO ENGLISH

My sister and my dad was on the bed.