The two little kittens have grown quickly and we have deduced that they're a boy and a girl.
The black one with a white undercoat is the boy and he's called Mario.
He is extremely playful towards his sister and he tends to bite hard on her so she yelps every now and then.
And thats his sister at the bottom and her name is Louie.
She is also very playful and she loves to climb on things.