No, it isn't LB's father in the pic. I caught a glimpse of him in the background when someone interviewed LB at his hotel in the Bahamas. His dad has grey hair and his wife is blonde and looks a somewhat younger.
LB was seated and the camera briefly panned up some stairs in the background where his father and step-mother were standing.
They didn't show them long enough that allowed for remembering features to provide a detailed description, but the guy in the picture is definitely not Mr. Birkhead.
Found the video! Access Hollywood interview.
Title of Video - A Victory for Birkhead?
There are two videos here. The first also has a brief shot of LB's dad. Video then goes to the interview at the hotel that pictures father and step-mother.
http://video.accesshollywood.com/player.html?dlid=82424
They have a large selection of Larry Birkhead Interview videos at the site. (on right-mid page)
http://www.accesshollywood.com/news/ah4513.shtml?dst=rss%7Cgeneral_rss