When they accept your invitation, they can
Give kids money so they can shop in Windows and Xbox stores without a credit card.
See activity reports about what kids do on devices, including buying apps and searching the web.
Set age limits for rated content like apps, games, videos, movies and TV.
Set time limits for how long kids can use devices.
Find children in the family on a map, when they have Windows 10 mobile phones.
via Add an adult