Brain Bender...

...from the handy dandy discount MENSA calendar. Ready to play?

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Jane has twice as many brothers as she has sisters. Her brother Jim has one more sisters than he has brothers. There are no more than eight in the family.

How many boys and girls in the family?

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And more importantly, what are their names? Anyhoo, like always the answers will be found later in the comments. See you then!