My dad past away several years ago before passing away he singed the deed of the house to my moms name due to problems with my brother is that halal or haram in Islam on his behalf

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

Dear brother, we do not know what you meant by your saying, “He signed the deed of the house.” Do you mean that he registered the house in her name? Or he didn't do that, but he just signed the title deed [i.e. deed of transferring the ownership], for example, and what did he want with this? Did your father want her to own the house after his death and not during his life? Or did he want the house to be for her during his lifetime as a gift from him to her?

If this is what is meant, then did he make her possess the house and made her dispose of it as its owner?

If this is the same house in which he lived with his wife, did he take his belongings out of it and move out to another residence and left the house to her, or did he stay with her in the same house until he died? All these details are important in order for us to issue an answer, and we do not want to prolong the answer to all these details.

If you are keen on knowing the answer, then please provide us with the details of what we have mentioned above, and we will provide you with an appropriate answer.

Allah Knows best.