Hi Sammie, welcome to the forum.
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.
Mark