Question: a man has 5 sons riddle?
Answer: 2 {couple}+ 5 {sons}+(5*7) {as each son has 7 sisters}+(7*3) {as each sister has 3 babies}= 63 people. Doraemon: Stop it you idiot, if 1 son has 7 sisters that means 5 sons must also have 7 sisters i.e, the couple have 12 children.