todoist seems nice. It is an app that does one thing and does it well. If you want to do more than just tasks, check out my app: https://circles.app It creates tasks too, and you can assign tasks to your family members. But you can also create and share notes, lists, links, files, photos, etc.
Any where I can find more info about circles before creating an account? Your website (at least on mobile) has almost no information about what I am signing up for.