I’m so sorry to read about your loss, my mum went through the same thing, I was 18 and have 3 younger brothers, the youngest was 11 at the time. It was obviously devastating for us all so I do sympathise, I know your world has been turned upside down but it will get easier in time.
I’m sure your doing a better job of being a mum than you give yourself credit for, just hang in there, you are going to be ok.
So sorry for your loss. I can’t even imagine how devastating that must be for you and the kids. But try not to be so hard on yourself, this is all still very new to you and you need to give yourself time to adjust. As long as the kids are fed and clothed you are doing fine. You just need to grieve and take each day as it comes. You’re doing great, you’ve got this xx