Question

here's a riddle someone wants to solve but i have no idea how

A newly wed couple adopted Billy, while also having a biological daughter. Billy finaly turned 19 on the 19th of March but unfortunately his adoptive parents, who were only 11 years older than Billy at the time, died of an illness on his birthday. Exactly 11 years after his parents died, Billy, too, died a tragic death in a car accident, on his way to celebrate his birthday with friends. When will Billy's 12 year old sister die?

Answer 1

Answer:

I think 11 year later die

Answer 2

Answer:

Explanation:wow very hard