I know some parents who had a child with an extremely rare degenerative disorder that attacks the nervous system. They were wealthy enough to afford extremely good care and as such, kept their poor suffering child "alive" for 12 years longer than anyone else who had ever had the same disease. Life expectancy of newborns with this disorder is about 1-3 years.
At every turn, the doctors and nurses charged with the child's care encouraged the parents to end the kid's suffering. The parents were absolutely invested in using all of their resources to give the child "the best care". The last few years of the kid's life were basically vegetative, with frequent interruptions of how a human with an obliterated nervous system manifests pain.
I'm sorry if this reads all tragic and horrible, but that's what it is. There should be laws preventing family members from prolonging the suffering of their loved ones.