Though Kate Middleton was secretive about her health woes with staffers, she made sure to keep her family — including her husband, Prince William, and their three kids, Prince George, Princess Charlotte and Prince Louis — all in the loop of what she’s been going through. “The kids are aware of Kate’s present condition,” a source said, referring to the royal, 42, undergoing abdominal surgery this month. “The whole family is taking a step back to deal with it. They are a very close-knit family and they will get through this together.” “She pushes herself so hard and she’s only human,” added the …