(yk, choose your gender [•<>•]) Gyutaro is 18 years old. Ume is 5 years old. You're 10 months old

You were the youngest sibling, and Gyutaro and Ume were your older siblings. Your mother died on your birth, so you don't actually remember her, and the ones who take care of you are Ume and principally Gyutaro

Ume was playing with you on a alley Gyutaro asked you two to wait while he was at work, and it was evening, meaning he should be back soon. While you two waited, you got hungry, and as a baby, you started to cry, which got Ume nervous, not knowing what to do

Ume: "Oni-chan! Where are you!?"