Unless your company is directly contributing to clinical immortality, children are always a priority for long-term development. That's where all the future owners, managers, employees, and customers come from.
Once a kid knows how to behave appropriately in public, any exposure to their parents' jobs also teaches them how to behave appropriately at the workplace, and what to expect after leaving school. If you don't accept this at your own workplace, you are pushing that burden onto someone else's workplace, or accepting by default any cultural shift that may occur in future workplaces.
As I would not expose my own kids to a workplace environment that I did not find to be minimally acceptable, seeing kids around is to me a sign of a healthy work environment. Not seeing them is a red flag, but it could just be because your workplace does not allow visitors.
This is the same principle that causes me to lower my opinion of employers that do not hire people with zero experience. You are simultaneously pushing the burden of assimilation and training onto other people, stunting the development of the people you do hire--as they are denied mentorship and leadership opportunities--and passively accepting that you have a much reduced role in shaping the future of the industry.