"Ali is in a home-schooling program. She has never been pulled out of school," Dina tells PEOPLE exclusively. "It's the same home-schooling program that Lindsay was in since the tenth grade. It's a wonderful program that many celebrities are enrolled in."
Defending her parenting skills, she says, "I am a single mom of four children, and I devote my life to my children."
As for the claims that Ali has been bitten by the partying bug, Dina says her daughter "is working, working hard. She's recording, and she's working on a fashion line. Ali has also been supporting her sister."
Lindsay Lohan, who recently split from longtime girlfriend Samantha Ronson, is also focusing on her career, says her mom. "Lindsay is working extremely hard. Her spray tan line sold more than 100,000 units at Sephora in one day."
Dina understands that her family's high profile garners media attention, but says, "We just wish people would leave us alone – at least for Mother's Day!"
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