I`m a mother of three orphans. Is it permissible for me to spend on myself from their salary, such as buying a Jilbab*?
                                All perfect praise be to Allah the Lord of the Worlds. May His peace and blessings be upon our Prophet Mohammad and upon all his family and companions.
It is permissible to take a reasonable amount that is equal to your services to them. However, it is better that you don`t. The evidence on this is that Almighty Allah Says (What means): "Make trial of orphans until they reach the age of marriage; if then ye find sound judgment in them, release their property to them; but consume it not wastefully, nor in haste against their growing up. If the guardian is well-off, Let him claim no remuneration, but if he is poor, let him have for himself what is just and reasonable. When ye release their property to them, take witnesses in their presence: But all-sufficient is God in taking account." [An-Nisa`/6]. And Allah The Almighty Knows Best.
 
* A full-length outer garment, traditionally covering the head and hands, worn in public by some Muslim women.
                             
                        
                            
                                
                                Should missed Sunnah prayer be made up?
                                Making up missed voluntary acts of worship is from Sunnah.
                             
                        
                            
                                
                                Is it permissible to swear by (Allah "The Living")?
                                Yes, it is permissible because "The Living" is one of Allah`s Attributes.
                             
                        
                            
                                
                                Is It Permissible to Divorce One's Wife for not Praying
                                All perfect praise be to Allah the Lord of the Worlds. May His peace and blessings be upon Prophet Mohammad and upon all his family and companions.
You should do your best to save her from hellfire by making her observe daily prayers on their prescribed times, even if this means giving her a generous incentive. However, if she insisted on her position, then it is permissible for you to divorce her. And Allah The Almighty Knows Best.