I’m helping my in-laws increase the security on their wi-fi network.  These two are 97 and 100 years old.  I think it’s unlikely that they can move to better security but I was a software guy, not a network person.  Can someone advise me please. You’ll have my gratitude and the gratitude of a man who landed on Omaha beach.  Thank you.

I suspect that a new modem is a better option but these two don’t manage change well.  So if I can make their network more secure it would be easier.