Of all the fathers and sons who have pitched, Ed Walsh has the lowest career earned run average (1.82) and his son Ed Walsh (Jr.) happens to have the highest career earned run average (5.57).
Did you know that Mel Stottlemyre and his sons, Todd and Mel (Jr.), have had the most strikeouts of any other father and son combination?
Do you know who the first black father-son combination were? It was the Hairston family [Sammy -> Jerry -> Jerry (Jr.)] who recently joined another family combo when their grandson broke in with the Baltimore Orioles during the 1998 season.