Take your Mom to Tavern in Brentwood
http://www.tavernla.com/brunch.html
The brunch food is delicious; service outstanding and be sure to request a table in the atrium. You might also tell your Mom that this is where President Obama dined last week. Another plus, is that Tavern is not raising its prices for Mother's Day. It is the usual Saturday-Sunday brunch menu, served from 10-2:30. Only 15 minutes from Culver City and convenient free parking.
There is also a full bar. Save room for dessert.