I implemented this in this app iOS: https://apps.apple.com/us/app/collaborative-groups/id1478800849?ls=1 https://apps.apple.com/us/app/collaborative-groups/id1

I implemented this in this app iOS: https://apps.apple.com/us/app/collaborative-groups/id1478800849?ls=1 https://apps.apple.com/us/app/collaborative-groups/id1478800... Android: https://play.google.com/store/apps/details?id=com.groups.network https://play.google.com/store/apps/details?id=com.groups.net... Which also has some nice features like sharing your tree with others and working together on them