Nonresidential fathers appear to spend a varied number of nights with their children suggesting a more complex relationship than can be captured in simple questions of residency status (e.g., Who do you live with all or most of the time?). Recall calendars or time diaries provide a potentially effective method for collecting data on nights fathers spent in the same residence as their children. This FRPN study examines the use of a modified time diary, in the form of a recall calendar, to assess the number of nights children spent with their fathers in the past 30 days and compare that data with information on residency status.