T.. .__ n recent years an increasing number of A disease entities has m-oven to be due to heritable genetic or chromosomal abnormalities. Identifying familial disorders is of obvious value now in counseling affected individuals contemplating parenthood; furthermore, the future possibility of correcting faulty genetic material exists. The purpose of this paper is to report a familial occurrence of Wolff-ParkinsonWhite syndrome in which current chromosome inspection and counting techniques have been utilized.