I would not wish that on anyone as a blessing or otherwise.
And as you lay dying in the hospice, you can say to yourself "Thank God I saved all that money and energy by squirreling that kid away in a home like "Rain Man"! Look at all I have in my bank accounts!
It’s an obligation and will leave a family broke with no life. Often times it causes divorce as the man usually bails. The healthy children in that family also suffer the lack of financial resources.
Please don’t suggest a major handicap is a blessing and I hope you don’t wish that form of “blessing” on anyone.