A male wearing a hoodie entered a house in Ballybunion on Bank Holiday Monday, before brazenly making away with a handbag left in the hall.
The injured party was in the sitting room at Glór na dTonn when they heard a noise.
Their brother went to investigate when he happened across a male, in a hoodie, standing in the hall of the house.
The suspect then made away from the house with the handbag.
Gardaí believe access to the premises was gained through an unlocked patio door.
Anyone with any information is asked to contact Ballybunion Garda Station.