@TeamYouTube I have successfully added my wife and my daughter to my YouTube TV family account. However, when I added my son and he successfully accepted the invite it won't allow him to log in on the iOS app as it tells him he's not a member.
We already did that. Even deleted him from the family then re-invited him and followed the process again I reached out here because @YouTubeTV told me to. I’ll try the link you sent. TY.
YouTube: