Tell him to say 'hi' from all of us here in the Forum.
I think the question you eventually intend to ask is, apostrophe or not.
He is going to go to his parents' house.
He is going round to see his parents.
I think you can get away with no apostrophe whichever is meant when you say
He is going to go to his parents.
(Partly, because it looks odd in print to see a sentence end with a word with an apostrophe like that.)
Student or Learner