control one mac from another mac

Good Day;

I use screen sharing. It is simple and works very well. I screen share with two people in my city and also my brother in another province with no issues. I send a request via Messages (the received person does not need messages running), the Received person only needs to hit allow and you are in. I also use it for my wife's computer in the kitchen and a mac mini down in my workshop. I like the screen sharing as it is a imac built in app not a 3rd party app

To turn on screen sharing, https://support.apple.com/en-ca/guide/mac-help/mh11848/10.14/mac/10.14

Hope this helps

regards

Neil

With Zoho you send the remote user a software link, they download and install the remote client software and allow for full disk access in the security and privacy pane and it's job done. In some cases you have to allow screen recording too otherwise you can't see the Desktop, but at the end of the day it's a doddle

Had been going to suggest you look at Apple remote Desktop, https://support.apple.com/remote-desktop I'd forgotten all about it because it's an old App that has changed much over the years and other Apps have more functionality

Personally I use Zoho, https://www.zoho.com Possibly overkill for your needs but not that expensive and they provide quick responses to tech support questions which is an important plus in my view.

I'm assuming the mother would have difficulty understanding directions to configure it herself.

If that's the case, have her send you the actual machine, and you configure the remote access directly on her machine so it automatically lets you login. Both Teamviewer and Anydesk offer this capability.

Are they on the Same Network?

In SysPrefs>Sharing, have you setup Screen Sharing or Remote Management?

Even if they're not on the same network, if the OP knows the IP address of the destination Mac, they should be able to just screen share in.

I like TeamViewer

How about Port Forwarding then?

I don't use screen sharing but this Apple article fourth bullet says the computers must be on the same network.

If you can’t share Mac computer screens - Apple Support

They would have to know the public IP address.