What would you do if you found out you'd been raising another couple's child - and they've been raising yours? Fourteen years ago, Kelsey and Raf Maccioni left hospital with their newborn daughter, Ammy. Days later, Shona and Nathan James welcomed the birth of their son, Zac. The only thing the two couples have in common is the IVF clinic where their dreams came true. They are strangers to each other - for now.