Drawing pedigree examples using Graphviz

Graphviz is a nice choice for drawing pedigrees. See my recent post about drawing pedigree. There, I wrote that I will probably use Pedigraph for large and complex pedigrees and Graphviz directly for small ones. I needed to draw two simple pedigrees today and I decided to bite the bullet and to try the Graphviz approach - in the past I used to draw pedigrees using MS PowerPoint, which is a very good piece of software, but the process of drawing was tedious. I needed two simple pedigrees for demonstrating the calculation of coefficient of inbreeding. I used the same approach as shown by David Duffy (example, his homepage, more info). The examples are:

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