Keeps ordering of Node in a same rank


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


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


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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