For months, Nancy Iskander came to court hoping to get justice for her two young sons, who were struck and killed by philanthropist Rebecca Grossman as she drove her SUV through a Westlake Village crosswalk. Iskander offered graphic, wrenching testimony about witnessing Grossman’s Mercedes speeding toward the boys as they took a family walk in their neighborhood. At sentencing on Monday, she recounted how Grossman refused to apologize at the hospital that night. Now, Iskander says she is disgusted with how the case ended. Los Angeles Superior Court Judge Joseph Brandolino on Monday sentenced Grossman to two concurrent terms of 15 years to life, with three concurrent years for fleeing the scene of the fatal crash. That means Grossman will serve 15 years to life. She had been facing 34 years to life in prison. “I feel this was a stab in the heart to me that he counted these two lovely boys as one kid,” said Iskander, who felt the sentences should have been imposed consecutively, one for each of her sons. “These are …