If anyone of the couples from the royal family had a kid with Down’s syndrome would they treat the kid as an equal?

I don't believe they would treat the child as George V and Queen Mary did their youngest son, who suffered from severe epilepsy and autism. He became known as the 'Lost Prince' because he was kept away from the public eye. It isn't the way either William or Harry would treat any child they had with Down's Syndrome. They live in the 21st century and not an era where old Victorian ignorance dominated.