TCS Company Numerical Ability Age Problem

one person has no siblings and says,"the guy in the photo is the only son of my fathers's son". what is the relation of the guy to the person

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TCS Other Question

49 members attend the party.in that 22 are males,17 females.the shake hands between males,females,male,female.total 12 people given shake hands.how many such kinds of such shake hands are possible? in a shopping mall with staff of 5 members, the average is 45.After 5 years a person joined them and the average is again 45. what is the age of 6th person?