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.
IIUIC, using parent and child constructs requires a sandclock construct.
In this case, the `proband'[1] would be your `G' node...why not go all the way to start with `I' and just use parent constructs?
[1] `proband' is used in genealogytree's initial sandclock examples, see `Creation of a Basic Sand Clock Diagram'; it's basically the node to ascend and descent from.