Go in and make a "Custom" list with your Mothers channels in it,label it Mom.
When your using the remote, go back to All if you want that selection, or make up one with YOUR channels as well.
As for removing channels, you place a check mark next to the ones you WANT in the guide, not the other way around.
What recvr are you using ... as many have mentioned, the "Channels I Get " never worked until the new H/HR24's came about.
That said, you'll still want to remove channels if you go that route, seeing the commercial channels and whatever else, you technically DO receive, so it would still show them.
As for getting rid of channels so they don't show regardless, you would have to go into the Channel Block section and set a password ... remember your password.