If you are a woman, your mother or mother-in-law may be representing an aspect of yourself that you need to examine more closely.
Family members in a dream can mean many different things. They may simply be themselves and the dream may be dealing with some aspect of your family life or your relationship with these family members. Consider the dynamics and interpersonal relationships within the dream and how they may be different from waking life. There may be an important lesson to learn about yourself and/or your relationship with your family.
In movies, books and video games, Zombies are known as the “undead”. They are shown as being detached from others and without emotion. They have no purpose or goals in life. In dreams, Zombies represent aspects of self or others that exhibit these same characteristics.