Ben,
Not all Councils enter parent data into ScoutNET which is part of the reason why Scoutbook does not automatically associate parents with Scouts. Also, the youth application on has a space for 1 parent so at most you would only get this data.
The volunteer written and supported Feature Assistant Extension for Scoutbook for Chrome and Firefox has the ability to import parents from a csv file. See Feature Assistant - What is it? for details.
