У моих родителей тоже было счастлив

У моих родителей тоже было счастливое детство, но они уже многое уже забыли .

Результаты (английский) 1:

My parents also had a happy childhood, but they are already much has been forgotten.

Результаты (английский) 2:

My parents, too, had a happy childhood, but they were already a lot has been forgotten.

Результаты (английский) 3:

my parents have a happy childhood, but they've already forgotten.