Ten years ago, the average age of a family of four members was 23 years. Three children having been born, the average age of the family is same today. What are the present ages of children, if two children are identical twins and differ by one year from the younger one?

Ten years ago, the average age of a family of four members was 23 years. Three children having been born, the average age of the family is same today. What are the present ages of children, if two children are identical twins and differ by one year from the younger one?