Hi, his mum was Mary Muirhead Paton, also Mary Paton Douglas (she was illegitimate, and her names varied). She died in 1909. Alexander appears as a witness at his brother Robert's wedding in Haggs in 1930, but after that noone heard any more from him. The address he gave as a witness was Haggs, so it's possible he didn't stay in Arran for long, but neither did he stay in Haggs. Many thanks.