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Female
Circle

Male
Square

Unknown Sex
Diamond

Parents
Connected by single horizontal line

Offspring
Stem off vertical line from parent

Related parents, such as two cousins (“consanguineous)
Double line

Generations
Roman Numerals
Twins
Diagonal Lines stemming from vertical lines connected to the sibship line
Identical (monozygote) twins
Diagonal lines are linked by horizontal lines


Frateneral (dizygotic lines) Twins
Lack this connecting line
Probrand
Indicated by an arrow connected to the designation p, the individual whose phenotype first brought attention to the family
