I was flat out unable to use the family sharing feature of YouTubeTV. Support from gooogle was helpful but they didn’t have much to offer in the way of a workaround. They researched it and basically told me to get gmail accounts for everyone in my family or share my google account with my kids (!!!). Interestingly, I asked if I switched email providers if my account would revert to one that would allow family sharing. They couldn’t guarantee it.