If you have multiple Apple IDs in the iTunes Store and the App Store, you can invite each of your accounts to the group, so you can share purchases from your other Apple IDs with your family.
Can you do family sharing with different Apple IDs?
With Family Sharing, you can create an Apple ID for a child under 13.* This allows them to participate in Family Sharing and use other Apple services such as iCloud, iMessage, FaceTime, and Game Center. To participate in Family Sharing, all family members must have their own Apple ID.
Can I share my iTunes with another Apple ID?
Family Sharing requires a personal Apple ID signed in to iCloud and iTunes. To share purchased content, all family members must use the same Apple ID country or region. Music, movies, TV shows, and books can be downloaded on up to 10 devices per account, five of which can be computers.
Can I have two Apple IDs on the same device?
There’s no problem in what you suggest: You can use any Apple ID to sign into any device for iTunes, iCloud, iMessage, and more. Using multiple Apple IDs might be confusing and cause issues with accessing purchased content or using some services. If you have multiple Apple IDs, you can’t merge them.
Can I use a different Apple ID to download apps?
On iOS devices, you can transfer purchased content from one iOS device to another if you use the same Apple ID and iCloud account and you installed the same version of the app.