It can be very hard to be the sibling of someone with a disability. Many times, the parent must spend a lot of time with the "special needs" child, and the sibling(s) without disability can be neglected emotionally or even physically.
This doesn't get blogged about often but I was struck by a recent blog post. What happens when one sibling has a disability, one doesn't, and the sibs are twins?
This isn't the case with Bil and his sibs. They are either a few years older or a few years younger.
But, I loved that post, and I highly recommend the blog the blogger of that post writes about Down Syndrome issues.