"Thirty-seven percent of parents held in state prison reported living with at least one of their children in the month before arrest, 44% reported just prior to incarceration, and 48% reported at either time (table 7). Mothers were more likely than fathers to report living with at least one child. More than half of mothers held in state prison reported living with at least one of their children in the month before arrest, compared to 36% of fathers. More than 6 in 10 mothers reported living with their children just prior to incarceration or at either time, compared to less than half of fathers.
"Parents held in federal prison were more likely than those held in state prison to report living with a child in the month before arrest, just prior to incarceration, or at either time (appendix table 7). Mothers in federal prison were more likely than fathers to report living with a child."

Source

Glaze, Lauren E. and Maruschak, Laura M., "Parents in Prison and Their Minor Children" (Washington, DC: US Dept. of Justice Bureau of Justice Statistics, Aug. 2008), NCJ222984, p. 4.
http://www.bjs.gov/content/pu…