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ultimator

Very simple. U jus ask the boy, "If i ask ur brother whether ur father is at home or not, what will he tell ?"

Whatever this boy tells, u need to understand that it is the opposite of the actual situation. We need not find who is who. Jus need to find whether their father is at home or not.

This more like a boolean algebra qsn.

Assume that truth(+) speaking boy comes out. When u ask that qsn, he'll think what his liar(-) brother will say and tell something.

U need to do the opposite.

+*- = -

Even if liar boy comes out,
-*+ = -

So, whatever the answer is, u need to do its minus (opposite).

Hence solved.

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