Family Dollar begins its invasion of California with four new dollar stores opening in Southern California this week. Discount retail rivals, like 99 Cents Only Stores and Dollar Tree, are already established in California and are not happy with the news, understandably. The new Family Dollar stores are opening in Fontana , Ontario , Rialto and Riverside , and Southern California customers will certainly not mind the convenience of more retail locations to buy low-cost merchandise. Family Dollar plans to open 48 new California store locations in the next 10 months.