I wouldn't get two. especially not if you're getting kittens. Two cats will play together/will scratch the furniture together/will chase one another up and down the curtains - can you tell I have two cats? .
Seriously though two kittens will wind each other up and cause twice the destruction.
Do bear in mind that there are no guarantees that your cats will want to cosy up with you. I have two, and although they're very affectionate and friendly, it's very much on their terms, especially one of them who will only come to you if she feels like it and never sits on laps at all.
they will scratch your furniture, if you get kittens they will climb your curtains, and if you have wallpaper they will climb that too. If you don't have a cat flap you will need a litter tray and they are horrible and need to be kept away from the baby.
also they will bring home birds/mice etc not all of which will be dead and you will have to either deal with releasing a bird/mouse back outside, or, worse case senario, have to put seriously injured prey out of their suffering .
On the plus side cats can be lovely companions, you don't have to take them for walks and they are largely self sufficient so as long as they are fed and stroked on demand you should all get along great.
do check with your local rescue though as many won't rehome cats to families with young children.