YOU SAID:
grandfather please stand on the shoulders of my father while he's deep sea fishing
INTO JAPANESE
おじいさん、父が深海で釣りをしている間、肩の上に立ってください
BACK INTO ENGLISH
Grandfather, stand on my shoulders while my father fishes in the deep sea
INTO JAPANESE
おじいちゃん、父が深海で釣りをしている間、私の肩に乗ってください
BACK INTO ENGLISH
Grandpa, sit on my shoulder while my father is deep-sea fishing
INTO JAPANESE
おじいちゃん、父が遠洋漁業をしている間、私の肩に乗って
BACK INTO ENGLISH
Grandpa, ride on my shoulders while my father is deep sea fishing
INTO JAPANESE
おじいちゃん、父が深海釣りをしている間、私の肩に乗ってくれ
BACK INTO ENGLISH
Grandpa, sit on my shoulder while my dad goes deep sea fishing
INTO JAPANESE
おじいちゃん、父が深海釣りに行く間、私の肩に乗って
BACK INTO ENGLISH
Grandpa, sit on my shoulder while my dad goes deep sea fishing
That didn't even make that much sense in English.