Is it permissible for a wife to give up her share of inheritance without her husband’s permission?
Question

                My husband was away for four months and during his absence I went to the court and gave up my right to my share of my father’s estate willingly. My husband objected to that because before my father died he bought a piece of land from him, but the transfer of title was not done officially, and he is afraid that my brothers will deny him his rights. Am I wrong?.
Praise be to Allah.
    A woman has the right to dispose of her wealth however she 
    wants, if she is mature and knows what she is doing. This is the view of the 
    majority of scholars. 

    Ibn Qudamah (may Allah have mercy on him) said:  
The apparent meaning of 
    what al-Khuraqi said is that a woman who is mature and knows what she is 
    doing has the right to dispose of all her wealth, by giving it in charity or 
    by buying and selling. This is one of the two views that were narrated from 
    Ahmad, and this is also the view of Abu Haneefah, al-Shafi’i and Ibn 
    al-Mundhir. There is another view narrated from Ahmad, which is that she 
    does not have the right to dispose of more than one-third of her wealth for 
    nothing in return, except with her husband’s permission. This is also the 
    view of Malik.  

    From al-Mughni, 4/299. 

    See also question no.
    48952 

    But in the interests of a good relationship with her husband, 
    the wife should tell him about that, especially in this case where there is 
    the possibility that he may lose out on his rights to your brothers. 

    So long as you have in fact given up your right to your 
    inheritance, you should try now to please your husband and remind your 
    brothers of his rights to their father’s land, and that they have no right 
    to deny him because giving others their rights is such an important matter 
    and consuming the wealth of others unlawfully is such a grievous sin. 

    And Allah knows best.