Arthur is 2 years older than Susan, so he is 15 + 2 = <<15+2=17>>17 years old.

Bob is 11 years old, so Tom is 11 - 3 = <<11-3=8>>8 years old.

So in total these four family members have 11 + 15 + 17 + 8 = <<11+15+17+8=51>>51 years.

# Answer

51
<|im_start|>system
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<|im_start|>user
Susan, Arthur, Tom and, Bob are siblings. Arthur is 2 years older than Susan, and Tom is 3 years younger than Bob. If Bob is 11 years old, and Susan is 15 years old, how old are all four family members in total?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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user
51
Susan, Arthur, Tom and, Bob are siblings. Arthur is 2 years older than Susan, and Tom is 3 years younger than Bob. If Bob is 11 years old, and Susan is 15 years old, how old are all four family members in total?
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