I'm thinking of setting up family sharing for our family. We're all adults, so we buy apps for ourselves, but it would be nice if we could share the apps. Will I lose the ability to buy apps with my own Apple ID if I join my family?
I have a workaround: What we have been doing is we have our family account under my sister's credit card. However, the individual members of my family buy Apple Gift cards. This is credited only to the individual family member's account. I usually buy mine at the grocery store, but you can buy them online as well. A little bulky but it works.
No. Any apps you buy with your Apple ID will still belong to you. If you leave Family Sharing other family members will lose access to the apps (Mac OS & iOS), movies, TV shows and music that you own.
Any family member's purchase will be charged to the credit card of the Family Organizer. Gift cards can be used by a family member and they will be charged before the family organizer's credit card. Family Sharing will bill the family organizer's credit card even if other family members have a different credit card on file.
Here is a link to Apple's own support document on this.
Family sharing is required if you wish to share Apple Music using the family plan. It is a great idea but all purchases of members go onto your card unless they purchase their own iTunes cards and load them on their own account. Family sharing prefers the creators card over the individual card. $14.99 to allow all members access to Apple Music is a great deal over the $10.99/mo plan for each one to have an individual plan. The downside is that if you are the organizer, you are likely going to spend more money for them to save since all of their purchases go onto your card. I am hoping Apple will provide additional options in the future so you can use the Apple Music Family plan only and individuals cover their own separate purchases.