I don't know how I feel about this, especially because they already had 3 kids [2 living]. I think it is selfish to deprive your kids of a full lifetime relationship with you because of age. When this baby turns 25, his parents will be 85 and 82. My grandmother is in her early 80's and just got diagnosed with dementia.
This was a reckless decision. I guess she expects her other children to raise them if something happens to her. I hope they refuse.