Dave Stenhouse (b. 1933) played in the majors from 1962 to 1964 for the Senators. He had a record of 16-28 with 214 strike outs and a 4.14 ERA. He was an All Star in 1962.
Mike Stenhouse (b. 1958) played in the majors from 1982 to 1986 for the Expos, Twins and Red Sox. He had 79 hits, 9 home runs and a .190 batting average.
I mailed the cards on March 28 and got the cards back on April 22, for a 25-day TAT.