Thanks Jack...
I have read that before, but I have heard and read reports of people in their 90s getting citizenship (One 94 yr old woman in Canada was an example) - and that site doesn't collectively admit or dismiss the notion. Through other comments you and other people have made on different threads I was wondering if what I was more or less searching for first was Official Recognition of Citizenship for my Dad, Aunt and Uncle - if that was possible, and if so, what steps to take. They were born in the 40s and 50s, but because of Segregation at the time, as well as the fact that my Grandmother had lived here the majority of her life - I don't know if she ever registered them...I guess I'm looking for a more clear direction.
Thanks.
The link provided above by Jacklantern does not appear relevant to your situation, since it deals with people born after 1952 and after 1986. Your father was born in 1940, which is well before 1952. The nationality laws were different at the time, and they changed several times since then.
It is now pretty hard to track exactly what the relevant laws were prior to 1952, and the effect of the subsequent changes (which sometimes were, in some respects, retroactive).
Here are two links to some State Department documents that provide some relevant info:
http://www.state.gov/documents/organization/86757.pdf
http://www.state.gov/documents/organization/153156.pdf
Much of this stuff is pretty obscure and you may need to hire a lawyer and maybe even a historian to sort out what's what.
The best I can tell from your first post in this thread, your paternal grandmother was born in the U.S. in 1912, so, presumably, she was a natural born U.S. citizen.
At the time your father was born in Bermuda in 1940, your grandmother was married to your grandfather who, at the time, was not a U.S. citizen.
The nationality law changed in 1940, with the new law going into effect on January 13, 1941.
Since your father was born in 1940, he would have been covered by the previous law, in effect from 1934 to Jan 13, 1941.
The relevant section of that 1934 law (see p. 51 in the first link above) said:
"The amended Section 1993 (48 Stat. 797), went into effect on May 24, 1934, at noon Eastern Standard Time. It stated that: Any child hereafter born out of the limits and jurisdiction of the United States, whose father or mother or both at the time of the birth of such child is a citizen of the United States, is declared to be a citizen of the United States; but the rights of citizenship shall not descend to any such child unless the citizen father or citizen mother, as the case may be, has resided in the United States previous to the birth of such child. In cases where one of the parents is an alien, the right of citizenship shall not descend unless the child comes to the United States and resides therein for at least five years continuously immediately previous to his eighteenth birthday, and unless, within six months after the child's twenty-first birthday, he or she shall take an oath of allegiance to the United States of America as prescribed by the Bureau of Naturalization."
This appears to indicate that your father did derive a conditional U.S. citizenship at the time of his birth in 1940 (since, presumably, his mother, your maternal grandmother, was a natural born U.S. citizen by virtue of being born in the U.S. in 1912).
However, that 1934 law, and the amended 1940 law, required your father to take certain affirmative steps
("the right of citizenship shall not descend unless the child comes to the United States and resides therein for at least five years continuously immediately previous to his eighteenth birthday, and unless, within six months after the child's twenty-first birthday, he or she shall take an oath of allegiance to the United States of America as prescribed by the Bureau of Naturalization.")
As I understand it, a change in law in 1995 made it possible for people who gained citizenship by birth abroad to a U.S. citizen parent but then lost the citizenship because they did not take the affirmative steps mentioned above, to regain their citizenship again. That's what the second link,
http://www.state.gov/documents/organization/153156.pdf, deals with.
So it could be that your father does have a shot for claiming U.S. citizenship.
However, there are many ifs and buts here and things that I don't really understand and that you'd need to research further.
E.g. it may be that your grandmother actually lost her U.S. citizenship prior to 1940 by moving abroad, marrying a foreigner and taking up residence there. So basically you'll need to do quite a bit of digging, and I do think that you need to get some professional legal advice here, and not simply rely on what you read here in this forum.