RustDesk. It works like TeamViewer: install the client on both machines, have the relative read out the client ID and one-time password over the phone, and you can connect immediately. It has self-hostable server components, but you can use the public relay servers without having to configure anything on the clients. You don't have to open any ports on the firewall either.

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

3 acronyms in this thread; the most compressed thread commented on today has 9 acronyms.

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I like TacticalRMM though may be a little more in depth than you’re looking for.

For your usecase, I would recommend Rustdesk.

But I would also like to mention Meshcentral. Meshcentral is a hosted application that lets you remotely manage multiple devices. It's different from meshcentral in that it maintains a constant connection, and you can do things like view files, run administrator CMD commands, in addition to being able to remotely connect and control the computer at any time.

It's more designed for managing a small enterprise environment, than individual support like OP is doing. The constant connection is designed to be a cheap, open source alternative to Mobile Device Management (MDM) solutions that do something similar. It is invasive though, since it is essentially a backdoor you put in the computer, whereas rustdesk is temporary, and only works when you have it open and are actively connected and using it. That's why rustdesk is more suitable for individual support than meshcentral is.

Although I wouldn't recommend it for OP, I'm leaving this up for anyone in the future who might be searching for "remote tech support" or similar, and maybe they will find Meshcentral more appropriate.

No love for VNC here?

The remote user can even download & run a reverse VNC which connects back to the helper.

Cross-platform...

Has anybody tried DWService? It looks promising, and if you don't shoot me down I'll try it to help my mother with her constant printer issues.

Rustdesk is what I use for tech support for my family. By default it uses the rustdesk official server for the handshake and holepunching or whatever, but you can also selfhost your own if you want to.

But I want to migrate to some kind of hardware web kvm like nanokvm, cause sometimes their pc doesn't boot and walking them through bios settings over a shaky videocall is a nightmare.