You'd do well to get genetic testing. Maybe you can get an hair sample or skin cell to test. You can test his mother, father, brother, sister, or other child too. See www.23andme.com and www.FTDNA.com.
Are you on the birth certificate? If so you are presumed his daughter. That said, you will have to go through genetic testing. This can take some time, so you should get going on that right away. If there is a probate in process, you need to file an objection and/or petition to determine entitlement right away as well. Good luck to you.
It is too late to establish paternity. If you are his natural born offspring you don't need to establish paternity to probate his estate. You need a probate attorney to help you.
Yes. Paternity required to inherit.
Some common, not all, evidentiary means of establishing paternity: name on birth certificate, genetic testing, holding out, acknowledgment of paternity.
Consult probate counsel to review all facts and means of proving paternity at your disposal.
Contact a local probate attorney ASAP to protect and preserve your rights, if any.
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