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thanks but I had already thought about this solution. I would also like to have a union with F

I need to add the parents in a "child" tree. In the following example I need to add the parents of the "F" node and a second wife/husband (union) of the "F" node.

\documentclass[english]{article}
\usepackage[all]{genealogytree}
\begin{document}
\begin{genealogypicture}[template=signpost]
child ...