As you have already used the word "grandparents" in the sentence, I would use "them".
Upon arriving at her grandparents' house in Malacca, Shella hugged them/her grandparents.
Should I use 'them' or 'her grandparents'?
Thanks.
As you have already used the word "grandparents" in the sentence, I would use "them".
Thanks, Anglika.