EXCLUSIVE: Blake Lively's Sister Robyn Gushes Over Actress' Parenting Skills: 'This Is Where She Belongs'

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Robyn Lively is one proud big sister.

While at the iHeart80s party over the weekend, Blake Lively's sibling praised the 29-year-old actress for being a great mother to daughters James, 2, and 3-month-old Ines. "This is where she belongs," Robyn, who has three children of her own, gushed to ET's Nischelle Turner. "She has my children and I have her children, [and] we're like, 'No, those are my children!' She's like, 'No, your children are my children.' We always argue about it. She's the best."

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While Robyn can't help but brag about Blake's parenting skills, the Teen Witch star did offer up some advice to her younger sister. "What I have told her is just to [not] feed them and water them too much because they grow up too quickly," Robyn, 44, quipped. "They just grow up too quickly, just cherish and savor."

As for how Blake's husband, Ryan Reynolds, is acclimating to having two baby girls in the house, Robyn said he's a pro at fatherhood. "He's amazing too. They're so great, and they protect their little family and they're normal," she noted. "Their family is everything and I'm so proud of them. They kept their sense of normality and that's amazing."

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Robyn also reacted to her niece, James, stealing the show at her dad's Hollywood Walk of Fame ceremony. "I'm telling you, look out," she jokingly warned.

Check out the adorable toddler during her father's big moment: