All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Requesting forgiveness from one's parents using the same wording mentioned in the question will benefit him. It is good for a person to ask forgiveness from his parents especially that their right is great and it is one of the most emphatic rights [that a person is required to fulfill].
Allah knows best.