How would your life change if your father became a millionaire?
If my father became a millionaire we...

Перевод:
  Как бы изменилась твоя жизнь, если бы твой папа стал миллионером
Если бы мой папа стал миллионером,мы..

Предложение:
if my father became a millionaire, we would have found it difficult to see him, because he would be busy with his work,because a million doesnt appear out of nowhere, so Im glad that my dad is not a millionaire