remove someones apple id

For recovering access to that Apple ID with a forgotten password, the holder of the Apple ID associated with the Activation Lock will have to use one of the following:

If you forgot your Apple ID password - Apple Support

If you forgot your Apple ID - Apple Support

Apple’s I Forgot Service

How to use account recovery when you can’t reset your Apple ID password - Apple Support

Contact Apple for help with Apple ID account security - Apple Support

Otherwise, somebody will need to present proof of ownership to Apple. That’s usually the original purchase receipt, or similar paperwork, or legal paperwork. For cases where the owner has passed, here is the Apple procedure:

How to request access to a deceased family member's Apple accounts - Apple Support

genesis___ Said:

"remove someones apple id: I need to remove my dads old iCloud id off of my old phone but I don't know his iCloud password."

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For future reference...

Getting Other's Device:

If one passes away, then contact the site, informing them of this issue. Here is where you would go for Apple: How to Request Access to a Deceased Family Member's Apple Account - Apple Support

genesis___ Said:

"remove someones apple id: I need to remove my dads old iCloud id off of my old phone but I don't know his iCloud password."

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Logging Out of your Dad's Account:

Stay off his account. Have him log out of it. BTW: There is no "iCloud ID" --all these is, is an Apple ID.