The 26-year-old actress says her 59-year-old father, who has daughters Mabel, two, and six-month-old Evelyn with wife Emma Heming-Willis, is no longer as strict as he used to be and has become ''very goofy'' with age.
Asked if he is still overprotective, the 'Always Woodstock' star said: ''Yeah, I mean now he's kind of shifted into this very goofy, fun demeanour. But he has two little babies too, which is crazy to me.''
Asked if she babysits for her half-sisters, she told 'Access Hollywood Live': ''Yeah, it's fun. I don't get to see them as much as I would like, but they're so awesome and so fun.''
Bruce also has daughters, Scout, 23, and Tallulah, 20, with ex-wife Demi Moore, and Rumer says they are all very close.
She said: ''My sister Scout actually was just with them and sent me a video of Mabel. She's kind of at this time where she's started repeating everything you say. Scout had her make this Vine, where she is saying, 'Hi my name is Mabel, I like Kanye West, oh yeah.' ''
Rumer also has a ''really cool'' dynamic with Scout and Tallulah.
She said: ''It's really fun. It's really cool when we get to hang out and just kind of go back to that age, we become 10 years old again, and we just make each other laugh. It's so fun. They all come and stay with me.''
The starlet is also very proud of Scout for walking around New York City topless earlier this year to protest Instagram's nudity policy after her account was suspended.
She said: ''Scout has always been one of those people that whenever she has an idea or she wants to stand behind something, she is very much that way, which I find so incredible.''
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