UMMM... Yes she does have a younger brother that i know of, well that i found out. im not sure if she had a sister but i don't think she did.
The brother's name is tom and he is younger than Barbara is. He was born when Barbara was 2 years old.
On a website it says that she had to older sisters but on another website it just said she had a brother so its your choice of which to pick and down below i have put the websites for you.
http://www.novelguide.com/a/discover/ewb_10/ewb_10_04322.HTML
http://www.nndb.com/people/011/000083759/
Try these websites out they might help wat ur looking for!!!!
Actually,
McClintock did have a sister, she was one of four children, i think she had two brothers and that she was one of two sisters.
Proof:
http://profiles.nlm.nih.gov/LL/B/B/P/M/
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