How to reply to the short message that my classmate's mother invited me to dinner?

Your classmate's mother invited you to his house for dinner, actually out of courtesy. If you think you are polite, you have refused twice, but you really want to go further. You can communicate with your classmate and see if his mother really invited you.

If his mother really invites you to their home for dinner, and you really want to go, mom can bring some small gifts to their home for dinner. In fact, eating at a classmate's house is not particularly serious. When I was a child, my parents often went on business trips to my classmates' homes for dinner.

But no matter what age you are, no matter who you go to, I think it is a very polite behavior, because they invite you to their house for dinner to express their goodwill, and you send a small gift to express your goodwill.

In fact, sometimes being too polite will make others feel uncomfortable, so next time you can consider not refusing, but agreeing to their invitation happily. Maybe this will help you have a better relationship with your classmates.