ABSTRACT
Questionnaire 2: ages of parents at birth of subject child; country of origin of parents, grandparents and great-grandparents; family income; occupation of parents and grandparents; occupations which characterize the family as a whole; educational levels and estimated level of intelligence of parents and grandparents; honours or recognition received by parents or grandparents; hobbies, interests and salient personal characteristics of parents and grandparents.
