The wife takes precedence over the mother in one matter only, and that is spending. If the husband is poor and cannot afford to spend on both his wife and his mother, then his wife comes before his mother.

Honouring parents in Islam is obedience to Allah and His Messenger (peace and blessings of Allah be upon him). Obeying and honouring one's parents is a means of entering Paradise. Respecting and honouring parents brings friendship and love. Respecting and obeying parents is a way of showing gratitude to them because they are the ones who brought you into this world.