Moving Xbox live account to a different Microsoft acount

I'm afraid this is not possible. An account is linked to an individual and moving things related to that individual to another account (i.e. most probably another individual) is not standard procedure.

However, perhaps this could be achieved if the case at hand is well explained to the official support team.

Alternatively you might want to consider two other options:

1. Rename/add another e-mail address to the existing account so you can keep using it, and your father can move to another (new) account, setting up what he needs there.
2. Register multiple accounts on you guest console.

I highly recommend taking ik up with the official, friendly support xbox support staff. Do know however, that they've been swarmed with questions the past few months, so it may take a while before your question gets answered by them.

I suggest you use
the green "contact us" button on the right side of this page.

Hi JonCook2, sorry but 2 different Microsoft account are 2 Xbox Live (and Gamertag) account different. You can't linked stuff from one to another.
The only solution you have eventually is contact the support, ask for a refund while explain your case, hope refund works and re-buy the DLC with the correct account.

Unfortunately it says I cant add an email linked to another Microsoft account

You could try to add it under account alias's

Hi there,

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you can NOT delete a xbox live account, you can only move it to a different Microsoft Account.

So you will need to move that unwanted xbox live account to a new (temporary) Microsoft Account and after that you will be able to move your GT (xbox live account) to that Microsoft Account.

Be aware that you can only move a xbox live account to a different Microsoft Acocunt when it has been on a console for at least 30 days, without it being downloaded.

This link explains on how to move a xbox live account to a different Microsoft Account:

support.xbox.com/.../switch-gamertag-to-different-microsoft-account