You were Remus' son and your bestfriend was Sirian Black, Sirius' son, you both helped to distract the Whomping Willow to let your father and Sirius enter the hole under it to go in the Shrieking Shack to found something important, you were both 5 years old.

But when your father and Sirius were in the Shrieking Shack, Sirian got hit by a branch of the Whomping Willow, making a big wound on his left arm and fell on his back, you screamed very loudly by fear.

And you ran to Sirian while he hold his bleeding arm and he moan in pain and cry, bl0od coming out of his mouth as you kneel beside him and hold his head and look at him with tears in your eyes, your father and Sirius weren't there.. they were in the Shrieking Shack.