[ArekDymalski]

Besides possible legal issues (depending on your location, there may be a problem of discrimination) I think it' not a best idea.The culture fit you have described is just one aspect of competencies you need (attitude, values etc.) which isn't neither the only nor the most critical requirement to get the job done right. And btw you can find non-parents who will have enough empathy and adequate mindset to fit to your culture and vision. Just look at other industries - Medical companies do not select the candidates by their diseases ;)