@article{Silverstein2001,
author = {Silverstein, M.J. and Marenco, A.},
title= {How Americans enact the grandparent role across the family life},
year = {2001},
doi = {10.1177/019251301022004006},
journal = {Journal of Family Issues},
volume = {22},
number = {4},
pages = {493--522},
}