But, they are so much more than that.
They are rat bags and cheeky, but they are also very mature and empathetic.
Here's why:
The day Mum found out she was pregnant with the Noisy Sister #1, she was so happy and excited. But a few hours later, she was sitting in a gutter; sobbing.
The day Mum and Dad found out they were having another baby was the same day they learned I had an enlarged liver. My little sister was already here, growing in Mum and suddenly swamped with anxiety, stress and worry.
Throughout my whole cancer treatment journey, my little sister was growing in Mum. She was there for every surgery. She was there for every chemotherapy treatment. She was there for every weekly blood test and check up. She was there when Mum wasn't sleeping and when Mum was scared and worried. Through some of the worst days in Mum and Dad's lives, my little sister was there, growing quietly in Mum.
When she came home, she wouldn't drink. She tried to drink from Mum and tried to drink from the bottle. I was close to the end of my cancer treatment journey, but the stress and anxiety in our home had intensified because she wouldn't drink. My doctor started worrying about her weight and there was a chance she would have to go back to hospital. Mum, Dad and Aunty Carol got as much milk into her as possible... and, finally... she started to grow!
I loved her; right from the start.
Dumped, almost.
The reason? Me.
Sometimes, my family have had to put them down to help me. I had terrible reflux and vomit was something I did all the time. There was a high chance of choking, so I needed immediate support. From their very first days, my sisters have learned that sometimes, I will 'come first', because I need the support. They are constantly shown that they are loved just as much as me.
And, do you remember the first time I 'crawled' across a room? It was to get to my Noisy Sister. Mum was having a quick shower and the Noisy Sister was crying. No one was coming to help her... so, I helped. I moved to her. I worked and worked and I got to her. Mum came in to find me holding her ankle, telling her she was ok. They know how much I love them.
Since she was tiny, the Noisy Sister has refused to go to sleep when I am not at home. Once, she finally fell asleep at about 4am... and was up two hours later. She has always looked at my photos, when I am away from her. And, she is always happy when I come back.
The sisters haven't really seen me when I've been really sick. They've been lucky, so far.
They have only seen me in an ambulance once. The paramedics were so good. They chatted with the girls, and talked about what they were doing. They were so calm and gentle that my sisters trusted them absolutely. And, before they drove away, they let my sisters stand in the ambulance. And, they put the lights and the siren on, for my sisters. That helped take away some of the scare.
They know they have to include me and that sometimes it takes a bit more time to do things. They know they have to be patient and helpful.
My sisters know I will lean on them, sometimes, and that I need their support.
Already, my sisters have tried to give me drinks and food. They have tried to brush my teeth and even wash me in the shower. The Noisy Sister sometimes checks on me and can now grab my legs and pull me away from furniture. They know that, while I am the big brother, they sometimes have to watch out for me.
They hold my hand. They pick up toys I've thrown and bring them back to me. They include me.
Already, they are very comfortable around anyone with a disability. They can see the person behind the disability. They can be supportive of the cerebral palsy, autism, down syndrome or vision impairment and enjoy spending time with the person.
My sisters are just three and one.
They are rat bags and cheeky, but they are also very mature and empathetic.
They are incredible little people.