Bare Facts: Female ~ Born est.1947 ~ Died 1997 ~ Mother Stubbs ~ Father Unknown ~ Children Cracroft, A44, Plumper, Kaikash ~ ID Thick, slightly curved fin; small finger marking on saddle

I don't have much info on this well-known matriarch either. But I'll give it my best shot!
Sophia is the whale that gives the matriline its name. She was born in 1947 to Stubbs (A1), though because it was SO long ago, we aren't positive.
Her oldest son, Cracroft (A32), was born in 1964 and still lives. The fact that she's his mother AGAIN isn't postive, but its most likely.
She DEFINITELY had a calf in 1973, designated A44. AMAZINGLY, this was a female!! Unfortunately, the young whale died after only two years, in 1975. Had she lived, she might have been able to keep the matriline going.
In 1977, she had another son, dubbed Plumper (A37). And finally, in 1982, she gave birth to her third and last son, Kaikash (A46).
Sophia is (I'm pretty sure) named after the Sophia Islands. Most whales are named after the places they were first spotted, or noticeable features on their fins (AKA Stubbs). None of the names (except the fin ones) I'm sure of, but I think its too much of a coincidence to have a whale named Sofia and the Sofia Islands right near by.
Around 1993, when the 1st edition of the ID book came out, researchers suspected that Sophia had had another calf. They were hoping this calf would be female and could continue the matriline. However, it was never confirmed or recorded. Either the calf died, or it never existed.
Sophia's fin was relatively unidentifiable to amateurs. That is to say, there was nothing very distinctive about it. The most distinctive feature was the little fingermark at the front of the saddle...and of course the three sons that were always close behind!