A joint tenant may validly sever a joint tenancy by unilateral transfer to themselves as tenant in common, without prior notice to the other joint tenant. Joint tenants do not owe each other fiduciary duties that would prevent such severance. A joint tenant has an enforceable right to compel a mortgagee to produce the certificate of title to facilitate registration of a transfer effecting severance. No personal equity arises in the other joint tenant from the mere fact that severance was effected without notice.
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