In the Fan Chart I would like to view both spouses and it only lets you select one preferred spouse.
It would be better if there was an option to cancel preferred spouse so that it shows more than one.
Where on earth would the fan chart put another spouse?
You can change the "preferred" settings as often as you need or want, so you can simply view the chart one way, change the setting, and view the chart the other way.
You may have to draw up a design to show what you mean since fan charts don't really show spouses. The only spouse shown is for the initial person. Otherwise, all you see on the fan chart is parents.
Do you mean that if a person had more than one set of parents you would want to squeeze four or more parents into the spot that currently shows the preferred pair of parents for that person?