Is it permissible for the children of a deceased father to settle his debt from the Zakah (obligatory charity) money due on them?
                                It is impermissible to use the Zakah of one`s money for settling the debts of the deceased. However, children should settle the debts of their deceased parents out of filial piety. And Allah Knows Best.
                             
                        
                            
                                
                                Is Zakah due on the orphan`s money?
                                Yes, Zakah is due on the money of the orphan.
                             
                        
                            
                                
                                What is the ruling on reciting the Chapter after Al-Faatihah , and what should a worshiper who forgets it do?
                                All perfect praise be to Allah, The Lord of The Worlds.                                                                                                                                                                  Any other part of Qur'an that a worshiper reads after Al-Faatihah during the first and the second Rak`ahs is a Sunnah, and forgetting to do so doesn`t nullify prayer, and doesn`t require performing Sujood As-Sahw (prostration of forgetfulness). And Allah Knows Best.
                             
                        
                            
                                
                                What should a person, who doubts the validity of his Wudu, or over performs it, do?
                                One who doubts the validity of his/her Wudu while performing it should redo it until he/she is certain of having attained purity. But, if doubt was after having performed Wudu, then he/she should not pay attention to that as doubt after the end of an act of worship does not count. This is of course in case doubt was within the reasonable limits since once it goes beyond that, it becomes a whispering of the Shaytaan (devil) which he/she should ignore as the Wudu is valid.