Q: location sharing not working properly through Family sharing

I have 3 kids - each have their own iPad and their own Apple ID

1 device keeps reverting to 'not sharing' and only 'not sharing' to me, the 'Family Organizer', another device I had to restore last night (as a new device) has been setup and now it is 'not sharing' location with me, even though I know I did the proper steps and have enable restrictions to avoid even accidental change.

How do i stop this from happening?  it is very frustrating as I am the only adult with an apple product in the family and I am the only one that can't see where the devices are and all my kids are under 10 years old and they leave their devices either at home or at their grandparents, I am not getting 'last location' when I look and the only way I can find them ultimately is making them ping.

How do i fix this as it has been going on ever since Family Sharing was started.