By 1908 he was helping Hortense and her sister Matilda McDuck run their brother's empire as Scrooge's chief accountant, mainly because Scrooge thought that as a possible heir he would probably work hard and stay honest. On 1920 he finally married Hortense and later in the same year became the father of twins:
He remained the chief accountant till 1930 when a fight between Scrooge and his family ended all relationships between them. Quackmore retired and it is unknown when exactly he died.