YOU SAID:

my dad comes back home with the milk if you like this

INTO JAPANESE

あなたがこれが好きなら、私の父はミルクを持って家に帰ってきます

BACK INTO ENGLISH

If you like this, my father will come home with milk.

INTO JAPANESE

あなたがこのとき、私の父はミルクを持って帰宅します。

BACK INTO ENGLISH

When you do this, my father comes home with milk.

INTO JAPANESE

あなたがこれを行うとき、私の父はミルクを持って帰宅します。

BACK INTO ENGLISH

When you do this, my father comes home with milk.