Sibling Rivalry Arises Between Tori Spelling's Kids

Sibling Rivalry Arises Between Tori Spelling's Kids
Tori Spelling and Dean McDermott with children Liam and Stella
Albert Michael/Startraks

08/25/2009 AT 07:30 AM EDT

She turned 1 only recently, but Stella McDermott is a quick study.

Her mom, Tori Spelling, says her and husband Dean McDermott's daughter has started standing up to her older brother Liam, 2.

"Everything's 'mine' now," Spelling told PEOPLE Saturday night at the Much Love Animal Rescue's third annual fundraiser Bow Wow WOW Howlywood! in Los Angeles.

"It's 'mine, mine, mine.' That's the new thing. Before, she was too young, so she gave [Liam] whatever. Now she pulls back and says 'mine' when he's pulling away a toy."

"Mine" is not the only word in Stella's vocabulary, noted the Tori & Dean: Home Sweet Hollywood star, 36. "Stella is talking up a storm. She's just turned 14 months and she's literally repeating everything."

Big brother is also doing some growing up of his own. "Liam's at the point where he doesn't just cry," Spelling says. "He puts on the big boy face where he's holding back the tears."

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