When do you tell work?

Melissa. • 🎀

I work in care with some violent residents i've told 2 of my seniors but one is a very big blabber mouth and I really don't want her telling anybody else as it's only early days I'm nearly 6 weeks at what point would you tell work?

Do I have a responsibility to tell them early as I work with some violent residents or can I tell them whenever I want?