"Still single and increasingly attuned to the cacophony of her biological clock, 40-something Kassie (Jennifer Aniston) decides that if she can't find a mate she'll still pursue motherhood with the help of a sperm sample that's not quite as anonymous as she thinks. As the baby grows up, Kassie's best friend, Wally (Jason Bateman), agonizes over whether to reveal that he secretly replaced the donor sample with his own DNA."