Duncan died on July 1, 1898. According to Dougie Forsythe, sons John and Gavin were running the business already. Both were members of the Aberfeldy Pipe Band. Apparently John did most of the work as Gavin cavorted about, eventually falling victim to pneumonia and dying on May 8, 1910 at the age of 35. John continued the business for sometime thereafter before leaving the business to pursue his passion for cabinet making.
John was said to have turned the ivory from the age of 12, and from the exceptional turning we know that he was very skilled. It is not known why Gavin's name is on the MacDougall bagpipes following Duncan's death.