How to invite both parents to dinner?

The man can go to the woman's house and formally make this invitation with her parents.

You can tell the woman's parents, uncles and aunts that I really like her through the communication with someone during this time, and we all think that the other person is the person the other person is looking for. Therefore, on behalf of myself and my parents, I formally invite you to meet my parents and have a light meal to discuss my affairs with XXX. I hope you can accept my invitation.

If the man has decided to let the woman's parents meet his parents, then basically they will get married. If the woman's parents are satisfied with the man, they should attend as long as the man makes an invitation.