"Node" doesn't mean anything to our users, it's just our internal representation. We need to use appropriate language in the user interface.
"Set this person to be the proband node" -> "Set this person to be the proband"
"Click to create a new partner node or drag to an existing node (valid choices will be highlighted in green)" -> "Click to create a new partner or drag to an existing person to create partnership. Valid possible partners will be highlighted in green while dragging."
There are probably more.