I bet this question has been asked a few times but I was wondering if there was a way to create a report that shows all the opportunities associated with a parent account.

For example, we have 1 parent account with 3 children accounts. The parent accounts have opportunities associated to it, and each of the "child account" also has their own opportunities. I would like to see a report of all the opportunities linked to the parent account. Is there a way to do that?