The Antique Coin of the Poor Fellow

The entire family members of old uncle Bob migrated to a foreign country leaving him alone behind. The uncle finds it hard to make his ends meet. He desperately needs to find a job to survive. One day, Joe finds his plight. He wanted to help the uncle. The only property of the old uncle is an old coin. The boys and their senior friend Jeff worked out a plan to help the poor man. They did something to make the old man rich enough. The old uncle is now the owner of a stationery shop. How did all of this happen?