Who is responsible for the division of the estate

Q: My father died leaving behind my mother, 5 daughters, 2 brothers, 2 sisters. According to sharia after deducting the burial expenses, debts and one third of the estate for bequests, the estate will be divided into 720 shares and will be distributed as follows: The wife will receive 90 shares, each daughter will receive 96 shares, each brother will receive 50 shares, and each sister will receive 25 shares.

One of the sisters died after my father’s death.

One of my uncle (father’s brother) and one sister denied taking any share.

Children of one sister who died after my father’s death are also denying taking their mother’s share.

  1. What should be done?
  2. Who is responsible for the division of my fathers estate?

Who has the right to perform the Salaah

Q:

  1. List the circumstances under which an Imam who is the most knowledgeable may in his own presence permit a man of lesser knowlege to be Imam for that Salaah; meaning that how is it possible for an Aalim to permit a hafiz to be Imam when the more knowledgeable person has the responsibility by virtue of his greater knowledge to correctly be the appropriate Imam?
  2. Does the Imaamat of the unappointed Imaam, despite it being out of place, does the Salaah of such an Imaam and that of those musallees following such an unappointed Imaam, become an invalid or null and void Salaah?

Makeshift Salaah facility

Q: Our work has a makeshift prayer room with a toilet and hand basin in it - is this acceptable? The room is alongside the female toilets and a meeting room and noises carry through the wall into the prayer room - is this a problem? I use a disabled toilet close to the prayer room (10 metres) and have used a plastic bottle for cleansing. The company has taken the bottle away as they say it is a safety problem. I suggested they instal a hand held bidet (like a shower hose) to remove safety problem.  But they want me to use another disabled toilet that is further away (more than 50 metres and through many doors) because they don't want to upset disabled people. How far away should cleansing be from the prayer room?