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Signal
I have an unfederated XMPP server (running Prosody), family's using Conversations (Android) & Dino (Linux) with it. We can chat, send images, do voice & video calls. Has been working fine & reliably for the past ~6 years or so. Took about 1.5 minutes for them to get used to the clients.
I'm slowly opening it up for friends too, so friends, neighbours, classmates, etc can chat with us too. It's going great so far, no complaints.
Signal is probably your best bet but it's only mostly open source. Element/Matrix is another good option if open source is your concern.
Signal is the most user-friendly option so far, which is also expected, given it's also one of the oldest one of those.
Simplex is also a good-ish option, but somewhat rough around the edges; the biggest benefit is, one doesn't need a phone number or e-mail to start chatting.
Matrix is questionable: it's quite feature-rich, but lacks solid android clients (IMO, fluffychat is among the best so far, yet when I last used it, it didn't handle stickers/custom emojis all that well, for example); as for the desktop/web clients cinny is a godsend due to allowing importing/exporting encryption keys manually, which just works all the time.
Has an onboarding wizard, includes text, voice and video calling, OMEMO encryption, group chats etc.
But more importantly, what have you tried and why didn't they work for you?
"Chat app" like texting/whatsapp?
Or "chat app" like Discord/Slack?
For the former, Signal is going to be the one your friends and family will actually use. For the latter there isn't anything really approaching the same level yet. Matrix/Element is making a good effort but absolutely not there yet, especially on mobile.
I would reccomend XMPP(with OMEMO), for android I reccomend the conversations client, but there are a lot of clients: https://xmpp.org/software/?platform=all-platforms I suggest you choose a client that fully supports OMEMO encryption.
I'm surprised that no one else has said this one yet: Delta Chat
SimpleX, best anonymity. Not really what u are asking for in terms of use case. It's a great messenger app, but still needs some refining in their UX. But I still like to mention it. Probably Signal then.
Signal is easy and straightforward to use
by "FOSS" you mean compatible with the core values of free/libre software?
This rules out Signal because: 1/ some of its server software is proprietary 2/ they dont allow you to communicate with "their" users if you want to run the server software yourself 3/ the prevented authors of free/libre software in the past to distribute their software (find a fdroid/signal thread) 4/ in practice they channel their users through their centralized servers hosted on AWS
(and that's without evoking their questionable funding, and long lasting commitment to make all their users identifiable through phone number, 10+y after US generals declared "we kill people based on metadata"....)
Simplex seems to me like the one really ticking all the boxes.
Signal is super user friendly. All my normie friends use it. Not super in the spirit of foss as it's not meant to be self hosted—which imo makes the server practically proprietary/source available. (ik people self host it anyway, but it's not supported and Signal don't like people self hosting or even making custom clients.) SimpleX is good too but not as polished as Signal.
I have a self hosted nextcloud that has a web chat feature (Nextcloud Talk). It is pretty easy to use, though it is kind of ugly and slow. I'd prefer to send people to GNU Jami but I've had kind of poor luck with that.
Revolt looks promising, but is more along the lines of Discord. It is less mature than other previously mentioned alternatives. https://revolt.chat/
You're asking for a literal unicorn. I haven't found one after years of searching.
Most of the options listed are easy to use. The difficult part is getting enough users to adopt the new system initially to motivate the rest to migrate as well.
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