How do you deal with sibling fights?

[ballyboy]

I have three boys aged 10,9 and 5.

The older two are very close in age. The literally kill each other all day long. Physically and mentally.

They are so so cruel to each other yet can be in fits of laughter together other times.

I don't know what to do with them. They have no boundaries in public. It doesn't matter where they are if a fight breaks out, they have no problem insulting each other I. Company, or having a physical fight. I feel when we are out I'm on edge waiting for them to erupt.

Any advice

When children are out in public, that is the time they should be on their best behaviour. This should have started from at least three years old, so that they are behaving like sub-adults at 9 and 10. I can only assume that you buried your head in the sand when they played up as little boys, afraid to raise your voice or discipline them in public. You will need to be tough on them now, poor behaviour MUST have consequencies. Say goodbye to phones, tablets, etc for 3 days first offence a week if it doesn't stop. They lose half an hour and go to bed early, and or miss their favourite TV. There behavour is unacceptable, the punishments must get more severe or have more impact if it continues.