Keeps ordering of Node in a same rank

 Hi,

I would like to represents family tree using graphviz, then I have use subgraph to represents each generation :

 

http://dugueperoux.esteban.free.fr/test/test.dot

 

but I can't constraints the horizontal ordering of nodes, I have the following result with edges intersection :

 

http://dugueperoux.esteban.free.fr/test/test.svg

 

How can I constraint ordering in dot language?

 

Best Regars. 

Keeps ordering of Node in a

Add the constraint
FirstSon -> SecondDaughterHusband [style=invis]
 

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