The whole thing is very sad but I see no reason why the maternal grandparents and the mother can't have contact with the triplets. They make it sound like the mother abused her kids when in fact she almost gave her life giving birth to them. Nobody will ever be able to say for sure to what extent the mother feels or understands. There is no reason to keep her kids away from her, kids learn to adapt at a very young age and as they get older they will resent being kept away from her.
Something smells fishy about the whole scenario, for one thing the father wanting money to help raise his kids....what would he be doing if his wife hadn't gotten that money and went home as a whole person with the triplets...what does he do for a living is my question.