I have question: My father and mother are still alive alhamdulilah.
If your mother is the owner of the flats then she has the right/choice to do whatever she desirous with it. However, it is imperative that parents adopt equality when handing gifts to their children. In certain circumstances or reasons, it will be permissible to give one child more than the other. If your mother has given your brother more then you because of a reason, then there will be no objection on her. If there was no reason then it would be better for you to be patient and not make your parents angry, better in angering them you are only harming yourself.
And Allah Ta’aala knows best
Attested to as correct by:
Mufti Muhammed Ashraf
22 September 2010 / 13 Shawaal 1431