My brother still has his deceased wife's name on the deed after ten years. Is this a problem for his daughters if he dies?

It is easy enough to take care of this. All he needs is an affidavit that with a copy of the Death Certificate attached. If he has a will, this would be a good time to get the will updated and have the affidavit taken care of. If he doesn't have a will, he really should hire an attorney to prepare both his will and the affidavit.