How about Ernie Johnson, Jr., son of the longtime voice of the Braves? Or Joe Buck, son of longtime Cardinals voice Jack Buck?
And doesn't Marv Albert have a son--I think his name is Kevin--who's a basketball announcer?
It's too bad this thread wasn't expanded to include children of local television personalities who went into other areas of show business. At the top of the list would be George Clooney, son of Nick Clooney of WKRC-TV Cincinnati (also nephew of Rosemary Clooney). Also, Sharon Lawrence of "NYPD Blue," whose father Tom is with WRAL-TV Raleigh. I don't know if Sharon ever worked at WRAL, but George used to appear on his dad's talk show on WKRC during school vacations.
Never knew that about Sharon Lawrence. The biggest name in this category other than George Clooney would probably be movie director Paul Thomas Anderson, the son of Ernie "Ghoulardi" Anderson. Then there's some guy Ernie worked with on local TV in Cleveland named Tim Conway, whose son, Tim Conway, Jr., is the evening guy on KFI in Los Angeles.