This is indeed the main obstacle to a strict prevention of consanguinity.
Consanguinity status was determined from the actual kinship terms used to refer to relatives.
There was no consanguinity and no family history of congenital heart disease.
In a subdivided population consanguinity of the mating system can have a negative influence on subpopulation persistence.
Examining the material as a whole, the haemophilia series suggests a general population level of consanguinity of 28-9%.
Consanguinity was apparently understood as a major cause of genetic disorders as early as the ninth century.
The distribution of consanguinity within the present sample is thus explicable in terms of the retention of conservative patterns of marriage.
At worst, the information merely notes consanguinity of parents, and notes relatives with similar symptoms.
