Chereads / XP / Chapter 546 - Grandparents

Chapter 546 - Grandparents

Since an 18 year old could adopt a 17 year old, wouldn't it technically be possible to be a grandparent (or even grand grandparent) at the age of 18? The 17 year old just has to be less than a year (365 days) younger than the 18 year old.