It is do-able..yes. It is right, no but you will get better, faster and more efficient. You will get better at time management, delegation and dealing with families more effective. The first 6 months will be the worst time, it will be a huge learning curve for you. You will make mistakes, you will miss things BUT every mistake is a lesson learned and next time, you won't forget
When in trouble, ask for help, not sure what to do, ask. I promise, you will get better and if after a few months, you feel this is not safe; find a new job with a lesser ratio.
My first 3 months were hell, by 6 months I was getting pretty good at keeping it together and by a year I had a real understanding of what I was doing and how to manage it all. This takes time, don't be too hard on yourself.
Also nothing wrong with asking for more orientation time if you feel you are not ready to deal on your own, but just keep in mind, your NM may not feel the same way.