Yes. Example: Bobby & Maggie Smith both create separate user accounts (on their respective phones) and are each considered a different account owner (with separate login credentials). Bobby creates Athlete Profiles for his children, Sara & Tony, within his Account Profile. Maggie is able to request that Bobby share these Athlete Profiles with her so that she can also view them within her user account. BUT Maggie will not be able to edit these Athlete Profiles or add new information to them. Read here to learn more about sharing Athlete Profiles amongst different accounts.
Therefore, we recommend that each family only have ONE account. The family can share the email/password and each login (on multiple devices). The family can create as many individual Athlete Profiles as they want within the one family account.