My kids are pretty close. There's 3 years between them, but most of the time they get on really well. They play together a lot, and big E lets little O tag along when he's playing with his friends too. I keep wondering how long it will last. I never played well with my sister, especially if either of us had friends over.
Being home all week without his brother has meant O has had to find ways to play alone. And he hasn't done too badly. I think the unlimited access to E's forbidden toys has had a lot to do with it, but I also think it's given him a chance to exercise his own imagination. E always directs the games and invents the plots, so without him, O has been forced to make up his own.
I hope it encourages him to put forward his own ideas when he and E are back together again. But I doubt it...
Do you have kids? Do they play nicely together or not?