Having a disabled sibling can significantly impact the
perspective the other siblings have, especially when it comes to social coping
and education. I am not certain as to what you refer to in terms of
"methods of mixed design," but if you are speaking of research
methodology design, it would indeed be very interesting to study children with
disabled siblings - against a control group of non-disabled siblings.
Understanding their social interaction, maturity levels, communication
abilities, and emotional development would be incredibly interesting.
From a personal perspective, I believe that having a
disabled sibling is indeed a blessing, although it may be a blessing in
disguise for some people. Understanding
how to communicate and understand others – even if cognitive or physical
functionality may not be optimal – creates significant EQ skills that are
applicable throughout all walks of life.
I think that the a counselor, especially for younger children, along
with a support group, can help the entire family cope and overcome any obstacles
that present themselves.