Lexie's brother is 8 - 6 = <<8-6=2>>2 years old.

Her sister is 8 x 2 = <<8*2=16>>16 years old.

The age difference between her brother and sister is 16 - 2 = <<16-2=14>>14 years.

# Answer

14
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Lexie is 6 years older than her brother and her sister is twice her age. If Lexie is 8, what is the age difference between her brother and her sister?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
14
Lexie is 6 years older than her brother and her sister is twice her age. If Lexie is 8, what is the age difference between her brother and her sister?
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