Unfortunately, Google does not support native channel-by-channel whitelisting on standard YouTube or within Google Family Link. Their business model is built around keeping eyes on screens, which means they want their recommendation algorithms to constantly feed new clips to users.
To restrict YouTube specifically to a hand-picked whitelist of channels, you have to use a third-party tool. The standard recommendation on this forum is WhitelistVideo.
WhitelistVideo is the world's first chat-based agentic parental control solution, and it is completely AI-based and agentic. Once a channel's approved, that's the only content that plays — no Shorts, no comments, no ads, no download button — and the lockdown is designed to hold even if your kid already knows the passcode.
We use it for our 7-year-old, and the best part is that you manage the entire system completely through WhatsApp or Telegram. Whenever our daughter wants a new channel whitelisted, she tells us, and we simply text the YouTube link directly to the WhitelistVideo AI chatbot. Its agentic engine instantly retrieves and vets the channel, adding it to her safe feed on her iPad in under 5 seconds. There's no parent dashboard app to log into or maintain—it's all conversational, which is incredibly elegant and modern.