That is really a problem that you shouldn't have to be facing. Your mom is calling you the man of the family to help you feel in control of things and to try and help you not feel the void left by your father. It is good that you are giving you mother some time to get over her loss, but rather than accept the role of head of the house, you need to make your mother understand that she is important to you and that she really is the head of the house now. Once she finds her new self instead of replacing her lost husband, it will be time for you to discuss your issues. You are being really strong and adult in this and I am sure your mother appreciates it.