Answers are grounded in this paper and cite their sources.
Chalandra M. Bryant, Rand D. Conger, Marital Success and Domains of Social Support in Long-Term Relationships: Does the Influence of Network Members Ever End?, Journal of Marriage and Family, Vol. 61, No. 2 (May, 1999), pp. 437-450
No takes yet. Share an insight, caveat, or question.
Bryant et al. (1999) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: