Individuals at risk in families with genetic disease.
D000367:Age Factors; D003376:Counseling; D005191:Family Characteristics; D005260:Female; D005799:Genes, Dominant; D005808:Genes, Recessive; D030342:Genetic Diseases, Inborn / Q000175:diagnosis / Q000517:prevention & control*; D006579:Heterozygote; D006801:Humans; D008297:Male; D010375:Pedigree; D012730:Sex Chromosomes; D012959:Socioeconomic Factors