"Warriston" (16 Main Road) was one of the biggest and most imposing residences in Castlehead, which was just as well, because Rowat had nine children. He had married Margaret Greenlees, of the textiles and shipping family, in 1856. Thirty years later both families were in Castlehead and Thomas and Margaret had produced an impressive brood, even by Victorian standards. There were four sons. Robert had his own shipping company, with offices in Wellington Street, Glasgow. This enterprise was eventually merged with the Greenlees interests. Thomas became a broker in London. Matthew became a tea planter in India and Claude a stockbroker in Glasgow. His company had become C.W Rowat and Millar by 1925.