Key points are not available for this paper at this time.
J. Jill Suitor, Karl Pillemer, Shirley Keeton, When Experience Counts: The Effects of Experiential and Structural Similarity on Patterns of Support and Interpersonal Stress, Social Forces, Vol. 73, No. 4 (Jun., 1995), pp. 1573-1588
Suitor et al. (Thu,) studied this question.