Use lists to record things for other people
Make a list for your Mum, Dad, Brother or Sister... Aunty, Uncle, whoever. When you add an idea to their list you can either let them see it, or keep it a secret by choosing who to share the wish with.
Keep some things private; make some things public.
When you make a wish, choose who you want to share something with. By default you can share with 'All Friends'; but you can 'Select Friends' to to choose from 1 to as many as you like, or choose to keep things totally 'Private'.