Changing Apple ID? Will I still keep previously purchased apps, songs, etc?

I want to change my Apple ID on my iphone from my family's account to my own created account. I have songs and apps along with in-app purchases that I had made on my family's account, however. If I switch accounts, will I still have my songs and purchased apps/in game purchases in my phone? Or will they be deleted since those were purchases made on another account?

Your purchased items will stay linked to the Apple ID. If you have access to the account, you can use it to download songs and apps onto your authorized computer/iPhone/iPad. They will stay on your phone or computer even if you sign in with another Apple ID. They will not be deleted unless you manually deleted them or performed a restore as new device.

However, if you intend to use the cloud to download already paid content onto your device, you will have to sign in again to your family's account.

They will stay on your phone as long as you don't connect to iTunes to sync, restore from a backup on iCloud or start as a new device. The apps are connected to the account though, so from then on everything will be on your account and not your families. So games may create new game accounts or have you re download apps as you are on the new Apple ID and updates from the games from then on will go to your new account. So basically unless you take anything off yourself, syncing, or from restore or backup they'll still be there.

No, if you use a different account, noting will be deleted. You can download songs ans apps if you also have account access. The content will stay on your computer until your manually delete it.