lol (same response here! parenting our parents, oh the fun)
then to sort how to redirect maybe hosts will still work for this (especially since they haven’t sorted hosts out yet!)… I do see 3 IPv4 addresses for startpage.com and 3 different ones for family.startpage.com so it “should” work with hosts.
another option may be some sort of small/simple server, or perhaps (in the name of security and privacy) set them up using dnscrypt-proxy w/DoH and even have reasonable sounding excuse/effect of startpage proxy appears to not “chain” well with other proxies? idk, interested to see what you come up with though!
(and still chuckling about it)