Great sin of delaying in winding up the estate

Q: My father passed away approximately seven years ago. My brother was the appointed executor of the estate. However, until today, he refuses to wind up the estate. Over the years since my father's demise, my brother has continued to run the business and deal in the assets left by my father at his own discretion.

My questions are:

1. What is the current state of the estate and how should it now be distributed?

2. What are the powers of the executor? Can he deal in the assets of the estate (e.g. sell them) without the consent of the other heirs?

Kindness to parents

Q: I want to know, I was an Athiest for a long period of my life. I have parent issues. I am a mujrim according to Islamic term. I do not have a good understanding with my parents. They have abundent me for some accusational issue. Beside I have some mind health problems. I heard if a child doesn't have a good relationship with his parents then Allah will not accept his duas. What if the the parent is wrong here and the child doesn't have any fault, will Allah understand my circumstances and dilemmas and accept my prayer? Will Allah help me out?