The 26-year-old actress told Access Hollywood she's been thinking a lot about her mother's relationship and marriage with the 36-year-old Kutcher. When Kutcher began dating Moore, he was 25, only a year younger than Willis is now. At the time, Moore was 42 with three children.
"I realized the other day that he was a year younger than me when he and my mom started going out," she said. "That would be like me meeting someone who already had three teenage kids. Kind of going into that situation was crazy."
Willis said she has a great deal of respect for both her parents in how they always put their kids before anything or anyone.
"My mom has always made how [my sisters and I] feel about situations the most important thing," she said. "I think it was more her going, 'Hey, this is my life and these are my kids and my priorities. So if you want to come and kind of join our crazy claim, this is what I already have kind of built.'"
"I find [that] so amazing and respectful," she said, with admiration. "It's one of the things that I admire most about my parents, is that they set such an incredible example for kind of putting their children first and keeping a family together, no matter what."
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Kutcher became engaged to Mila Kunis in February, and the couple welcomed their first child, daughter Wyatt Isabelle, in September. Willis said she contacted her former step-dad after the arrival of their baby.
"I reached out to him when he [and Mila Kunis] had the baby, which is so awesome," said Willis. "I saw photos of her. She's very cute…"