What should I do concerning my paternal uncle who refuses to speak to me after I tried to contact him repeatedly, subsequent to my father's burial by a friend of his without our knowledge? And should I visit him at his home, given his refusal to take my calls, knowing that my family is unaware of my attempts to reach out to them?

May Allah ease your sorrow concerning your father, and I advise you to honor him and supplicate for him. Your paternal uncles' accusation against your mother of killing your father is a grave offense and a form of ill-conjecture forbidden by Islamic law. Your kindness towards them, despite their cutting ties with you, carries a great reward. Strive to communicate with your uncle to end the estrangement, seeking help from those who have influence over him. There is no blame upon you for disliking them, as this is a matter of the heart over which one has no control. However, your description of them as hypocrites is forbidden, and you must repent from it.