although its not fair, its the wishes of their Dad. Somehow its nearly always the one who does the most gets the least reward.
I remember my gran putting her life on hold and going to look after her father for 8 years and she was promised the house in return, her siblings did nothing for their father and refused to take "turns" with his care, when he died she got nothing, he had left everything to his oldest son, my gran wasnt a money grabbing person at all, all she got was £200 as a gesture of good will.