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I'm sorry to hear about your situation, and my condolences on your loss. Typically a spouse has beneficiary rights to a pension, as the spouse is related to the recipient of the pension. Florida does not have common law marriage, and if you're not formally married to the person (or at least entered into a legal common law marriage with this person in another state prior to moving to Florida) then you wouldn't be considered a spouse. In that instance, the only claim that you would have to his pension would be if you were actually named as the beneficiary by him on the pension plan. If you were not named, then I'm sorry to say that you would have no claim whatsoever to the pension. This is even if it's true that you were living with him, in a romantic relationship, long term, considered yourself to be common law, etc... Only if you were his spouse or named as the beneficiary on the plan would you have a right to it.
I know this is probably not what you wanted to hear, but it is the law. I hope that clears things up anyway. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable.
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Thank you, ***** ***** luck to you!