Hiya, Children's rights include the right to play, rest, have a name, identity, to feel safe, have privacy, express an opinion, be listened to and be heard, have a healthy environment, access to clean water, healthy food, good information, protection from harm, to enjoy their own culture ..
For more detailed information this page on silkysteps has links to the convention and other websites -
UN conventions on the rights of the Child
Are you looking to have FC - father Christmas visit your setting this year? you could do an activity that looks at who he is, what he does and explain how Children have the freedom to approach for a gift when the time arrives, have someone approach with them or on their behalf?
Hope this helps, best wishes with it
xx