"Cousin" Tahj is actually the girls' real life younger brother
Bumper Robinson who portrays Mike previously played a bellboy last season.
Cousin Tahj (who is actually Tia and Tamara's younger brother in real life) later plays TJ Henderson, a tutor who helps the girls revise and study for the SATs. He can also be seen in the Christmas episode as Sammy; a little boy who visits the mall numerous times to see Santa.