“…They have also become somewhat more common due to the increase in the overlap of the number of shared years lived between and among generations (Ruggles, 2003(Ruggles, , 2007. Moreover, there is the availability, number, and hierarchy of kin, i.e., single, divorced, or widowed childless younger adult females have higher odds of coresidence, followed by single, especially teenage, mothers (Aquilino, 1990;Bengtson, 2001;Burr and Mutchler, 1992;Choi, 1997Choi, , 1999aChoi, , 2003Elman and Uhlenberg, 1995;Goldscheider and Bures, 2003;Grundy, 2000;Isengard and Szydlik, 2012;Kok and Mandemakers, 2010;Macunovich et al, 1995;Martin, 1989;Messineo, 2005;Mutchler, 1992;Mutchler and Burr, 1991;Pilkauskas, 2012;Smits et al, 2010;Wilmoth, 2001;Wolf and Soldo, 1988;Zsembik, 1993; see also Chu et al (2011) for the Chinese and Taiwanese traditions). Older seniors are more likely to live in an upwardly extended household as they tend to have a deteriorating health, emerging chronic illness or disability, and/or functional dependence (Burr and Mutchler, 1992;Choi, 1997Choi, , 1999aChoi, , 1999bDunifon, Ziol-Guest, and Kopko, 2014;Elman and Uhlenberg, 1995;Gonzales, 2007;Kamo 2000;Macunovich et al, 1995;Messineo, 2005;Mutchler andBurr, 1991, 2003;Smits et al, 2010;…”