David Foster's daughters reveal their only issue with his wife Katharine McPhee
Sara, Erin and Jordan Foster only have one problem with their father David Foster's wife, Katharine McPhee. The couple got married just over a year ago, making McPhee, 36, stepmom to Sara, 39, Erin, 37, and Jordan, 34 -- as well as David's other children Alison, 50, Amy, 46.