User blog comment:Bennia Lover/Age of Characters/@comment-27083298-20170514231418/@comment-29963364-20170514232434

Depends on whether or not Tannin reincarnated into a Devil before or after his kids were born.

If Tannin became a Devil before he had kids, then they're less than 500.

If Tannin became a Devil after he had kids, then we don't know.