Standard pedigree conventions

   Circles  represent  females  and  squares  designate  males. A diamond
   indicates unknown sex.

   Individuals exhibiting the phenotype ("affected") have shaded symbols.

   If  the  parents  are related (consanguineous, such as first cousins),
   they are connected by a double line.

   Offspring are called sibs (siblings) and are connected by a horizontal
   sibship line.

   A number in a symbol represents numerous sibs of the same phenotypes.

   A  proband (p) is the first known affected individual in the pedigree,
   indicated by an arrow.