By Dan Marsh Legendary trainer Willie Mullins toasted his first Grand National win for 19 years courtesy of I Am Maximus, just weeks after losing his mother at the age of 94. Maureen Mullins, known as the ‘First Lady’ of Irish racing, sadly passed away back in February after a short illness. She was married to multi-time champion trainer Paddy Mullins and had five children, including Mullins. Mullins, 67, last triumphed in the Grand National back in 2005 with Hedgehunter. But I Am Maximus, ridden by Pete Townend, eclipsed both Delta Work and Minella Indo to storm past the post following a late…