![millennial-parents](https://api.time.com/wp-content/uploads/2015/10/millennial-parents.jpg?quality=85&w=2400)
On a playground in San Francisco, 4-year-old Astral Defiance Hayes takes a stick and writes his name in the sand. His twin brother Defy Aster Hayes whizzes around their father.
When the boys pause for snack time, Lucas, 33, a tattooed stay-at-home dad, peels each of them a banana. One of them balks…
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