Why do some people find it difficult s to provide support for their parents even after becoming so successful in Life

 Here is A story  of A young boy called Isaac who was born in Apologamious family becoming the last born to the Second Wife of Mzee Juma . He lost his mother at the age of 5 years but everyone abandoned him including his own father and his blood sibling.His father could always support his first wife who used to beat the young child and toured him emotionally , psychologically and physically. Eating in his step mother house was like aprevilage and most of the time he could be chased out to his mother grave by his own father while others were eating. He used to wipe his teaVrs when he ask his father to take him to school or even pay him school fee after seeing his step sibling admitted to good kindergatten school. Most of the time he kept praying in his mother, gravep and ask God whether he will make it one day. Just   one Tuesday he came across to one Canadian Samaritan who came to his mother land to do some business project in his country , who took him to one of the best academy boarding school and cartered for him everything.The boy kept the fire burning by  maintaining the first position and high grade making the lady to even support him more. By bad luck the lady went back to her country  putting him in the hand of one person who she will be sending him money for his fee but the greedy man squander all the money making this white lady to stop donating fee for that boy at form 2 level.The boy went back home but none wanted to assist him to raise the fee inorder to continue with his studying including his own blood rich brothers and sisters. He went and registered form four as aprivate candidate learning in community library and getting frustration every time. When he sat for his exam he surprised many by scoring grade A- becoming the top student in that school. He got a scholarship to study law in America and even graduated with the first class honour and even he got job in that country today he is multibilionaire with Alot of businesses in the country and his father who is very poor  now want to take him to the court that he have refused to help him dispite that he he is his own child and even says alot of evil curses to him. 

Is it right for this son not to support his father or ?