I imagine this would vary based on the ages of the kids. My little brother and I are about 2 years apart and shared everything, even clothes at times. If ours were 2 or so years apart I think everything would be shared except for the special things. With T being 5 and 1/2 when #2 is born and past 6 by the time little brother even knows with a toy is, I doubt much will be shared. No electricity experiment sets for 1 year olds, IYKWIM. And I doubt a nearly 7 year old T will pine away for push toys and super fat crayons (though I am sure their will be some jealousy). I have already started boxing up toys from T's tot hood with his help that he never plays with and telling him they will come out again in a few years when little brother is big enough for them. I am actually kind of concerned about keeping #2 safe from all the small parts and such in T's toys and also concerned about the new addition breaking delicate things.