Yes, the Full Swing app supports Apple Family Sharing.
Apple Family Sharing permits a single subscription to be shared for free with up to 6 family members. Please see Apple's help article on Family Sharing. https://support.apple.com/en-us/HT201088
Use the following steps to set up Apple Family Sharing. You can start a new family group and invite people to join, or you can join someone else's family group.
On your iPhone or iPad
- Go to Settings.
- Tap your name.
- Tap Family Sharing, then tap Set Up Your Family.
- Follow the on-screen instructions to set up your family and invite your family members.