Key points are not available for this paper at this time.
Parental Child Care in Single-Parent, Cohabiting, and Married-Couple Families: Time-Diary Evidence from the United Kingdom by Charlene M. Kalenkoski, David C. Ribar and Leslie S. Stratton. Published in volume 95, issue 2, pages 194-198 of American Economic Review, May 2005
Kalenkoski et al. (Fri,) studied this question.