Aww hugs honey, I'm sorry you feel so much responsibility especially if your Mum is out, but I'm sure she really values and appreciates what you do and hope you don't get into too much trouble. Have a good day and hope you stay awake
do u have a pet? from experience ive seen if u get both your pets and babies to play with each other a lot, they will expend all their energy and just fall asleep!
Just know that they love you and I know it is hard but in the end it will make you a better parent because you will not rush to have kids till you know you are ready.