ben affleck has apologized after he demanded information about a slave-owning relative be withheld from a pbs show about his ancestry .
as dailymail.com first revealed , producers agreed to the actor 's demand and cut the segment from the program .
` i did n't want any television show about my family to include a guy who owned slaves . i was embarrassed , ' he wrote on facebook .
pbs has launched an internal investigation into whether or not finding your roots violated their editorial standards by allowing this request .