Its complicated😆...Actually he was very attached to his father and sister. He felt angry that they were asked for his sisters marriage who was extremely beautiful and talented to a blind man even if he was a prince of hastinapur...the result of that was his sister blinded herself as her duty, love, sacrifice and he felt that it was an insult and punishment to her and their father was heartbroken that he could not prevent the marriage and that his daughter had sacrificed her sight he was heartbroken which spolied his health and he died adding to the insult ...Shakuni felt after all this Dhritrashtra should have considered himself lucky for having married Gandhari...and showered her with love and affection..instead he ill treated her and made her unhappy and sad...Originally posted by: poulomi12
I doubt the sister love though! All he wanted was take revenge from Kuru vansh for the death of his father who died in prison on Bhisma's orders.