I wonder what would be a more personal (and interesting) question than: - Describe your relationship with your mother - Describe your relationship with your father Completely open-ended, yet, is universal to everyone. Being candid in that area can provide a lot of foundational underpinning to understand someone. But - would people find it awkward? Would they take offense? Feel pain thinking about the answer? As for s…
But it’s not that hard to get there a little less directly. If you just ask about people’s days and weekends, their parents will come up at some point. Then you can ask more gradually and organically.