I didn't see anything sinister in this at all, but maybe I'm missing something. All I saw was a man and his wife caring for their disabled daughter, and wanting the grandchildren to be able to be part of her life. Granted, at this point, considering their age, it could probably be very traumatic for them, but I don't see where a webcam could hurt. At least they can see her, and when they are older and can somewhat understand her condition, that it won't be a shock to them.
And as far as the father of the children wanting child support - I'm out on that verdict. I guess I would have to know what he does for a living before I would say he should get anything.