Maybe. How many times did you ask your parents to tell you about her? How much did they like to talk about her?

If, for instance, to take a plot from a bad movie, your dad was from a wealthy, upper-class family, your mom was poor but honest, they fell in love and married, whereupon his family cut them off from all forms of communication, and he never spoke of his mother, your grandmother, again, then it would be perfectly normal for you to know nothing of her.

She may have made cookies and lemon tea for your first cousins, the ones from your dad's brother, who had three children by three wives, all of them as snooty as he was. When she did, she told them about her life. One of them created a very detailed find-a-grave entry for her.

Details would help. I didn't know my grandparents' social security numbers when I was growing up, but their SSDI entries have them. Did you find dry facts, like dates and places, or juicy stuff, like she worked for a marijuana smuggler when she was in college?

You didn't mention your country and or state if you live in the US.

No,not unless you are legally married or court ordered . This in the law in most states because he is ONLY the 'alleged" father - NOT the legal father unless you were married to him at the time of birth or conception..

You would both have to agree & in the state of IL for example - these are the steps for establishing paternity

"Both parents complete, sign and have witnessed/dated a Voluntary Acknowledgment of Paternity form;
An Administrative Paternity Order is entered by the State of Illinois' Department of Healthcare and Family Services' (HFS) Child Support Services; or
An Order of Paternity is entered in court by a judge."

In the state of WY for example, the father would have to sign an affidavit acknowledging he was the father if not married to the mother..

If you live in the US - depends on state law.

Here are the links I quoted from for the state of IL & WY

http://www.health.wyo.gov/rfhd/vital_rec...

http://www.childsupportillinois.com/gene...

If in the UK -look here

http://www.adviceguide.org.uk/scotland/r...

In CA - if you change your mind later & want to add the birth father ~

http://www.scdhec.gov/VitalRecords/Pater...

Good Luck

If you let me know your state, I can link you..

You mean a tribal enrollment number? Just contact the enrollment office for that tribe.

Blackfeet? You are sure? Your family is from northern Montana? There are only about 3 thousand blackfeet sfamilies, so it will be easy to verify. Here's their address. You will have to write them, as their website is currently down. ( like I said, very small tribe) Blackfeet Nation:
PO Box 850
Browning, MT 59417

Just send them the name, and dates of the person you are looking to confirm as a citizen of their tribe, and they can check their records.

Blackfeet? You are sure? Your family is from northern Montana? There are only about 3 thousand blackfeet sfamilies, so it will be easy to verify. Here's their address. You will have to write them, as their website is currently down. ( like I said, very small tribe) Blackfeet Nation:
PO Box 850
Browning, MT 59417

Just send them the name, and dates of the person you are looking to confirm as a citizen of their tribe, and they can check their records.