let them work it out with your guidance
This is coming from personal/work experience as my daycare is yet to open.
I really believe in restorative justice practices. So basically helping the children express how it makes them feel when dcb takes their toy and coming up with a plan with them as to what will happen when it happens again.
Dcb participates in this process to help generate ideas with your assistance. For example:"dcb, johnny just told you it makes him sad/mad when you take a toy he is playing with, did you know that it makes him feel this way?" "Do you have any ideas as to how we can stop the toy grabbing?" "What if sunnydays gives you high fives and reminders (praise) when you are playing nicely with others do you think will help?" "Dcg, do you have any ideas how we can stop the toy grabbing? Dcb2 what do you think you can do instead of hitting DCB when he takes your toy?"
Because of their ages in the beginning you will find you are doing most of the talking and problem solving but with time it can be pretty remarkable when you start to see them independently label feelings and problem solve. Obviously for nonverbal children you would talk for them e.g. "It looks like Johnny doesn't like when you take the toy he's playing with. I know when someone takes something I have it makes me feel sad." Helps children develop empathy as well.