He has 2 sons .One is a teacher,the other is a worker

问题描述:

He has 2 sons .One is a teacher,the other is a worker
He has 2 sons .One is a teacher,the other son is a worker
He has 2 sons .One son is a teacher,the other son is a worker这三句都对吗

one 和the other 已经是代词了 后面的son应该省略吧