“…A number of studies have shown a stronger cohesion of biological versus social parent–child ties in terms of emotional bonds such as feelings of closeness (Aquilino, ; Brown & Manning, ; Kurdek & Fine, ; Lansford et al, ; Voydanoff, Fine, & Donnelly, ; Zill, Morrison, & Coiro, ), contact (Aquilino, ), filial obligations (Aquilino, ), mutual support (Amato, Rezac, & Booth, ), and time and money transfers (Henretta, Soldo, & Van Voorhis, ; Pezzin, Pollak, & Schone, ). Longitudinal studies have indicated that stepparents, especially those who do not have biological children, seem to become less involved over time (Stewart, ), although this effect may be attributable to the fact that involvement declines as children grow older, coupled with the higher mean age of stepchildren compared to biological offspring (Teachman & Tedrow, , p. 17).…”