My father recently passed away and he left his girlfriend sole beneficiary of everything but there is no Will and they are not married. Is there anything I can do?
Your father's estate could sue her claiming the she used undue influence. You would have to establish that when he made the beneficiary designation, that your father was not of right mind.
So, girlfriend is joint owner of all your father's accounts, or POD beneficiary, and beneficiary of IRAs and life insurance? Is she also a joint owner of the house, with right of survivorship? That last is important as she may be a joint owner as "tenant in common," in which case you inherit your dad's half. If there is nothing that is not jointly owned WROS, then there really isn't anything you can do except be nice to girlfriend and try to be in her will.
There is no way for your father to have left his girlfriend as sole beneficiary of his entire estate without a Will other than joint bank accounts, and joint tenancies with rights of survivorship on his real property.
First I will assume that he was not married to one women and that he had a girlfriend on side. If that is the case, the wife would have rights. Assuming you were 18 or older when your unmarried/divorced dad died and he was competent when he made the beneficiary designations, he could leave his assets to whomever he choose, be it a girlfriend, boyfriend, charity, or family. There is no requirement that he provide for an adult child.
Your post makes no sense. If he had no will, he didn't have a beneficiary of his estate and she is not his heir. (If you mean he named her on insurance, no, there is nothing you can do about that).
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