There is no reason for "their."

“Now for the first time, hear secrets from the first Madoff family member to break their silence,”  says the ABC announcer in a promo for “20/20.”  Shown are interview shots that clearly depict Madoff daughter-in-law, Stephanie Madoff.  A female.  So why use the clumsy and ungrammatical their instead of her?  There is no excuse.