at my parents

In the semtence “I often go to the countryside at my parents”, is the noun phrase “at my parents” used correctly? Should I use "at my parents’ " or “to see my parents”?
Thank you!

Both are fine. The meaning of course is different.

Thank you. So even the original sentence “at my parents” is correct?

Yes, but you need the apostrophe for at my parents’, which I forgot to mention.