The other co-owner of your property cannot reduce your undivided 1/2 interest in the property without your consent. However, the other co-owner can convert the joint tenancy with the right of survivorship to a tenancy in common (no survivorship) without your consent by executing a deed. If you are unsure of your rights as a co-owner of property or if you want a review of your deed rather than a generic answer, you should consult an experienced real estate lawyer in your area.
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I agree with the previous answer and the change would only be effective on the parties who signed the quit claim deed not the others. You should take what you have to a local lawyer if you need more information.
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As a general rule, a joint tenant can "destroy" the joint tenancy by filing a deed as tenant in common or by conveying an interest in the property to another.
I am not a FL attorney, laws vary from state to state, therefore you should always consult a local attorney.
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