Katie's parents, Martin and Kathleen Holmes were specifically not invited until Tom was back home in Los Angeles after his worldwide promotional tours and could monitor the baby's first visit with her maternal grandparents. Reported Fox News.
But Tom's mother and sisters, were invited to witness the birth of Suri. Katie's parents were not.

They were heartbroken. The Holmeses are terrified to piss Tom off in fear they will lose all contact with their daughter and grand-baby. In all of Cruise's recent interviews for "MI:3" no one has dared to ask the one question "why".
Source: foxnews