What do you tell a child who asks if Santa is real?

{"type"=>"root", "children"=>[{"type"=>"paragraph", "children"=>[{"type"=>"text", "value"=>"This is the moment the Non-Believer Letter was written for. Many parents give it when their child starts asking bigger questions about Santa."}]}, {"type"=>"paragraph", "children"=>[{"type"=>"text", "value"=>"The letter is written so the moment feels like being trusted with the magic, not losing it. Your child becomes part of a quiet club of Santa Clauses, and you decide when the timing is right for your family."}]}]}