Charles Watt Allardyce born 1899 Aberdeen

I am trying to track where my grandfather went to after he left Aberdeen Scotland approx 1923/4.He emigrated to the USA but when he was divorced in 1929 his whereabouts were unknown. His father was called Henry Allardyce, his mother Elspet, he had four siblings, Williamina born 1889, Henry born 1892, George 1894 and Agnes 1896, Charles was the youngest.Does anyone know if there is any information about Charles after he went to the USA, or whether there are any descendents living.