For secured private chat, why don't you use https://0xchat.com/ over nostr? Start your own private nostr relay and add only your loved ones nostr pubkeys. Absolutely nobody will be able to read your private msgs.

Emails? If you still use email for business, run and host your own email server. Is not that hard. Then create accounts for your family, friends, business partners and exchange emails privately. You can run a email server even on a shity PC or a NAS.