Upvote:2
In 99% of the cases the border control probably won't ask you anything in detail for Q2 holders; but if you are asked it is not a good idea to lie. Or just book a ticket to your family's place. It is not prohibited to travel for tourism or business (not employment or study) if you entered legally on a Q2 visa.
The decision is yours to make. Note that China usually does not allow holding two visas of different categories, so your Q2 visa is likely to be cancelled, even if it can be valid for 10 years (for Canadian and US citizens).