Oh boy, I realized I did not say my opinion is based on an existing functional wifi5/AC router being in the house. If this is true, in my opinion, there is no need for these types of families to spend extra money upgrading to wifi6/AX. They can maintain until there is a need for a new router, or the existing one stops working.Any home router starting under $100. The simpler the better. If more than one routers is needed - Amazon eero, Google Nest Wifi, TP-Link Deco. Easy button solution and works well for non-tech people.
I updated my response to @L&LD.