She's the mother. She holds the family together after your dad left/died, barely managing to keep your bitchy/borderline sociopath older sister and naive/borderline retarded younger sister in line. Your arrival from college will allow her to hand the reigns of the household over to you and stop taking her pills.
Hobbies: yoga (she might need help with that from time to time), cooking, receiving massages, drinking wine in front of a romantic TV show and keeping the bath door slightly open while she takes a shower.
Not sure about the model, though.