I have two gorgeous boys.
Three yrs apart.
Eldest is 10.
They are best mates and I have always loved this about having 2 boys.
But they have recently really started bickering & really annoying one another on a regular basis. (They are still best friends in between these times)
My youngest said to me "it's just what siblings do mummy"
But it really upsets me.
I'm worried they will end up not liking each other if the bickering continues.
Help 
What can I do?