Liam Neeson's son Daniel Neeson has surgery for a rare congenital heart defect Liam Neeson's son Daniel Neeson revealed he underwent surgery for a rare congenital heart defect in a post shared to Instagram on Tuesday (03.03.26). 4 March 2026 Liam Neeson's son has undergone surgery for a rare congenital heart defect. Daniel Neeson in hospital / (C) Instagram Entrepreneur Daniel Neeson, 29, was born with a Bicuspid Aortic Valve (BAV) - "where the aortic valve has two leaflets instead of the normal three". And in an Instagram post on Tuesday (03.03.