You don't need to explain anything. I believe in reincarnation and accept the possibility of the boy having been reborn. Now...why are you getting all hot and bothered because of that?
In that case, Sriram, you believe in, and are peddling, woo: you've often said that what you believe is different from religions, and I think you are dead wrong - reincarnation is just a preposterous as dead men not staying dead.
Your beliefs are not justified by either method or evidence and can, therefore, be dismissed just as easily as, say, the beliefs of Christians in miracles - it's all magical and wishful thinking, often dressed up in the form of a Courtier's Reply.