Moviegoers embraced a supersize momma in a wig and a governess who tames an unruly brood as family-friendly films dominated the weekend box office. Twentieth Century Fox's "Big Momma's House 2," with $28 million in estimated ticket sales, turned in the second-best January opening ever, trailing only the $35.9 million scored by the 1997 release of a special edition of "Star Wars," according to Exhibitor Relations, which tracks box-office results. As in the original "Big Momma's House," Martin Lawrence layers on the bulges and dons billowy, floral-print dresses, along with a wig. It was followed by another new release, Universal...