In the Data Capture form there's a section for Family Situation. Where is this entered on the student profile?

In Admin>Students>Download Capture Sheet

you will find Section Two concerns Family Details. 

If you go to the student profile, on the Extended Tab under Support Information 

The dropdown options correspond with the fields on the Data Capture Sheet. You can also report on this area on ScholarPack by going to Reporting>Custom Report, new report, then on the right side Features Tab you will find Family Structure. This enables you to report on numbers of single parent families, etc.