The boy and girl died in a car fire yesterday.
A Westmeath club has postponed all underage games and training both boys and girls fixed for this weekend.
Multyfarnham GAA is also offering its deepest condolences to the family and friends of those who lost their lives in yesterday's tragedy.
Gardaí in Mullingar are investigating all of the circumstances surrounding the deaths.
An infant boy was removed from the scene by ambulance to Midland Regional Hospital, Mullingar, where he was pronounced dead.
The remains of a girl were discovered inside the car at the scene. Her body has been removed to Midland Regional Hospital, Tullamore.
A woman was treated at the scene for burn injuries. She was taken by air ambulance to a Dublin Hospital, where her injures are understood to be serious but not life threatening.
Longford Westmeath Sinn Fein TD Sorca Clarke says her thoughts and prayers goes out to the family and friends at this tragic time.