siblings

I am very to close and have always being very involved in the care of my brother with autism and I just wanted to ask if there are any other siblings on here who have similiar experiences or to ask parents how involved are your children who are not on the spectrum with their sibling(s) who are?

I have found that there seems to be more awareness of autism now than when I was growing up so I also wanted to ask how do you explain what autism is? This was something I found difficult to explain as a child to other children so just out of interest I would like to know what your experiences with dealing with this are.