"You know, we're sisters. We're twins," Mary-Kate says. "We work together, and I think to live separately, it gives you your space."
When it comes to relationships, the sisters also respect each other's decisions and space. "I'm not in a relationship, so I just support her," Mary-Kate says. "If she doesn't like him, I won't like him. If she likes him, I'll like him."
Mary-Kate says she gives Ashley her two cents about boyfriends, but in the end, her sister's happiness takes precedence over her personal opinions. "Whatever makes her happy," she says. "It's her life."