I am descended from Alfred the Great, who claimed descent from a continuous line back through Abraham to Adam. I guess that doesn't count, though.
Actually, Jesus said that he did not wish to change "one jot or tittle" of Jewish law, so Christians and Jews should be very, very close. I have always liked many Jewish teachings, even those which are not thought of as being distinctively Christian. For example, we Christians tend to emphasize the motive behind good deeds, and to insist that without the good motive, there is no merit. Thus Jesus advised that when giving alms (charity), one should act secretly, and not let the left hand know what the right hand is doing. The idea is to keep the motive pure, and make certain that the good is not done for adulation.
A Jewish friend told me that the same thing is taught in the Talmud. Then a rabbi told me that it is also taught that you should do right even if you do not have the motive fully developed, because if you act right enough, the understanding and the motive will arise, anyway. I think that he was absolutely correct, and that modern society misses this. It is why we think that manners do not matter; but I think that polite behavior causes a feedback to the individual. If you smile and are courteous, pretty soon you start feeling that way.
And if you causually use foul language and hostile, aggressive terminology, your inner feelings will begin to conform to evil.
The Jews have an expression: the mitzvah. It is a kind deed. Like a good Boy Scout, they are supposed to try to rack up one or more a day. My wife and I have adopted this expression, and we encourage each other in mitzvahs. It is not for adulation, but because it is good for the individual doer, and proper. The deeds we count are often small (and we speak of mini-mitzvahs and mega-mitzvahs, to distinguish), and we never mention to outsiders what we are doing. I think that it works to improve ones life to do nice things.
We do not go into the intricacies of Jewish law on mitzvahs (see http://en.wikipedia.org/wiki/Mitzva), but have simply adopted the idea.
The days when someone would be embarassed about having a Jewish grandparent (or maybe all-Jewish grandparents) should be long past. Anyway, it is what one does with ones life which counts. Live a good life!
That seems like a good system.