These families may appear to be 'happy' and 'coping' but either their child's disability isn't too extreme or they are getting enough outside support to be able to cope, but it still takes a toll and most of these things come at a price.
My sister is severely autistic, low-functioning, non-verbal with some other intellectual disabilities thrown in. My family is solid, but my parents have had to sacrifice much of their life for the past 34 years. I think deep down my parents are very angry, resentful and full of regret about the things that have happened to them and my sister.
It's not easy and coping takes a great deal of strength and willpower to overcome with a lot of anguish. I admire my parents strength and character to have never really faltered in their position, but I do not wish this struggle upon anyone and can understand if people had the choice to abort why they would.
If my parents could have had a diagnosis of my sister in the womb, and knowing what they know now, they probably would have aborted. My sister's quality of life and the trauma she experiences without a voice is just so horrendous to consider.