I'm a bit confused by the terms and conditions. I have a 16 year old, a 12 year old and a 10 year old wanting to be included under my Amazon Music Family account. However the terms say something about only sending invites to people in the family over the age of 13 years old only. What does that mean for my 12 and 10 year old then?? How do I include them? Can they be included?