YOU SAID:
your dad left to get milk and he didn't come back.
INTO JAPANESE
あなたのお父さんは牛乳を買いに出かけたのに戻ってこなかった。
BACK INTO ENGLISH
Your father went out to buy milk but didn't come back.
INTO JAPANESE
あなたのお父さんは牛乳を買いに出かけましたが、帰ってきませんでした。
BACK INTO ENGLISH
Your father went out to buy milk, but he didn't come back.
INTO JAPANESE
あなたのお父さんは牛乳を買いに出かけましたが、帰ってきませんでした。
BACK INTO ENGLISH
Your father went out to buy milk, but he didn't come back.
Okay, I get it, you like Translation Party.