Overview
Multi-account plans use seats. The plan owner counts as one seat, and active sponsored members use additional seats up to the plan limit.
For the plan owner
My Plan shows Members & Invitations, seat usage, the owner row, active member rows, pending invitations, and member-management actions when those features are enabled.
For a sponsored member
A sponsored member can see that membership is Included by plan owner. A member whose own direct plan is Free can inherit the active Family or Business plan scope. A user with another non-Free direct plan keeps the direct plan scope instead of silently consuming sponsored paid access.