Is it permissible for a husband to give a gift to his wife and not to the rest of his heirs?
Question

                Does the wife have the right to ask her husband to transfer half of his personal property to her? The husband is refusing to do that on the grounds that it is a trick to deny the inheritance to those to whom Allaah has granted it. My Lord has been testing me with childlessness for 19 years. He did agree to give me an apartment as an unconditional gift. Please note that I am his only wife and his parents are still alive.
Praise be to Allah.
    In question no. 72320 
    you told us that your husband has agreed to put the apartment in your name, 
    and that your mother refused to put the apartment in your husband’s name or 
    your name. We explained that there is no sin on your husband in that, and 
    that your mother has no right to stop him from putting the apartment in your 
    name. 

    Whatever the case, as your husband has no other wife which 
    could cause problems if he were to give something to you and not to her, 
    there is no sin on him if he gives it to you. 

    If he has willed half of his possessions to you, there is 
    nothing wrong with that, so long as he has done it willingly without any 
    pressure on your part and so long as he has not done that to cause hardship 
    to the other heirs, because so long as a man is healthy and is not 
    terminally ill, he may give whatever he wants of his wealth to his wife or 
    anyone else. 

    Based on this, you do not have the right to pressurize your 
    husband to put some of his property in your name, because he may do that out 
    of shyness towards you and unwillingly, and that will be haraam for you. 

    But it is better for your husband not to do that, because it 
    may cause arguments between him and his parents and be a cause of the 
    severing of family ties, so it is better to leave things as they are. 
    Moreover it is not known who will inherit from whom. And Allaah knows best. 

    We ask Allaah to bless you with righteous off spring and to 
    reconcile between you and your husband. 

    And Allaah knows best.