Also, be advised that life insurance is NOT normally part of one's estate, nor is any jointly held real estate or bank accounts that are titled so that the co-owner becomes full owner at death. IRAs and 401ks pass to the named beneficiary outside probate. If he died in a car accident or other accident in which HE may have had liability (DUI, for example), there may also be other legal action against his estate. If he was ill or hospitalized for an extended period, there may also be huge medical bills/care bills against the estate. And burial expenses.
IF he has assets in his estate, a claim can be made. If he died intestate, daughter is entitled to her intestate share of the remaining estate. If she was named in a will, same thing.
Adoptive parents ARE "real" parents. Sharing genes is not what makes you a "parent"!