No, the daughter should remain on the account, unless there are other facts that would require her removal. The guardian for the mother steps into the mother’s shoes as one of the joint tenants on the account, but that would not affect the daughter’s ownership interest in the account. 

For resources related to our guidance, please see:

• Manta v. Kahl, 348 Ill.App. 373, 377 (1st Dist. 1952) (A guardian — referred to in this case as a “conservator” — “succeeded to the identical rights” of the ward under the deposit agreement for a joint deposit account.)