A children's list is a list for children whose parents are owners/tenants in the association/rental property. If you are a tenant/owner of one of the list’s properties, you can check if there is a children's list in your association/rental property.
You can read here how to find out which lists exist in a given association/rental property: Where can I find information about the lists in a given association/rental property?
Be aware that there may be special conditions within the individual associations/rental properties. If you do not know the conditions for a children's list, you should contact the association/rental property.