Router, Dummkopf, router. Not PC software, router. A parental filter comes as standard with the routers from most internet providers, including my BT one. You can filter content on various criteria, including sexual content, violence, drugs, alcohol, gambling and other things besides.
How to Set up Parental Controls in Windows 10 https://www.lifewire.com/microsoft-family-safety-parental-controls-4153037