What Major League Baseball team was the first to wear numbers on their jerseys?

Question

In 1990, who became the first son and father to play on the same Major League Baseball team at the same time (the Seattle Mariners), and the only father and son pair to hit back to back home runs?

Answer 1

In 1929, the New York Yankees were planning to start the season with uniform numbers on the back of the jersey. The Indians also planned to wear numbers in this fashion. The Yankees were rained out on opening day, April 16, while the Indians played, making Cleveland the first MLB franchise to wear numbers on the back.