YOU SAID:

Dad went to the supermarket to go get the milk he never came back

INTO JAPANESE

お父さんはスーパーマーケットに行って、二度と戻ってこなかったミルクを買いに行きました

BACK INTO ENGLISH

Dad went to the supermarket to buy milk that never came back

INTO JAPANESE

お父さんは二度と戻ってこないミルクを買うためにスーパーマーケットに行きました

BACK INTO ENGLISH

Dad went to the supermarket to buy milk that never came back