Hi,
I have created flows, both advanced and normal, and i have synced with Google Home. I can activate my flows using Google Assistent, but when my husband tries to activate the flows, he cannot. The same goes for the other way around.
We have both synced to Google Home, and we have both made the flows favorite.
In Google Home you can chokes the automation for you familie or you yourself. It’s the Home assistent that is the issue. Make a new automation for your family (is your husband registers as family momber?)