Not a perfect answer to your question, but two thoughts:
Is the focus on building the physical product or defining the problem?
These are focused less on the empathy side, but incorporate technical detail and testing.
For empathy, is there another camp, or a partner in the camp they could work with? They can easily design chairs for each other and get feedback, or make flexible seating/lap desks for younger kids, etc.
You might also skim the local news stations clips or newpaper for human interest stories that lay out problems. We did a transit challenge and did things like find a parent who had go-pro video of their bike commute we could talk to, and a local news story about how slow bus service made it hard for working moms with childcare, etc.