1Password is a life-saver in this regards. All my kids have their own vaults but for the little ones I have them use a shared vault between my wife and me so we have access to their passwords. I can also easily share passwords for services like Netflix so the kids don’t have to bug me.
It has been great for teaching kids about password hygiene (what makes for a good password) and management (don’t reuse passwords!).
And it being cross-platform is great for my older kids with gaming PCs.