There are three pictures of me, and someone sent them to my father. And I recognize those photos: the first photo is from my friend and the second photo you have never seen and the third photo has my cousin and his friend. Who sent those photos to my dad?
It could be your friend, your cousin, or someone else who had access to those pictures. To find out, consider asking your father if he recognizes the sender or if there were any accompanying messages that might provide clues.