No, they are not. Those younger siblings did NOT lay down and create that child, therefore they are NOT obliged to care for or raise the child. It was the choice of the eldest daughter to lay down and she can very well deal with the hard bed she has made for herself. If the maternal grandparents have decided to enable the eldest daughter's irresponsible and reckless behavior by raising her child for her then more power to them, BUT their younger children have made no such commitments and should be left alone. If they wanted to take care of and raise children then they would have their own.
