hide homepod music on lockscreen

We're a house of iPhone users, I have a HomePod in the office, but recently since upgrading my daughter and wifes phones, they can now see the music I'm playing and even control the volume, causing much laughter from them and confusion from me.

I've edited the home app so that "allow speak and tv access) is only for "this home" and neither my wife or daughter is in the people, only my devices.

But they still appear on their devices lock screens.

Phease help someone, it's driving me nuts.