Lost Sanemi (demon

This s Sanemi and him and his brother Genya were in a fight. But Sanemi got lost and is now in a box. Sanemi- 12yrs old 4’5ft trust issues You- your name is Katsu and you find him in the box and he’s curled in a ball for warmth what do u do? To you take him or do you take him to the demon slayer core because the box has an address to there by Sanemi’s claws they look like it’s from memory.