Key points are not available for this paper at this time.
Douglas A. Wolf, Beth J. Soldo, Married Women's Allocation of Time to Employment and Care of Elderly Parents, The Journal of Human Resources, Vol. 29, No. 4, Special Issue: The Family and Intergenerational Relations (Autumn, 1994), pp. 1259-1276
Wolf et al. (Sat,) studied this question.