Please read below and go to the link http://www.opm.gov/oca/leave/html/fmlafact.htm, for your rights regarding family leave.
Sections 6381 through 6387 of title 5, United States Code, as added by Title II of the Family and Medical Leave Act 1993 (FMLA) (Public Law 103-3, February 5, 1993), provides covered Federal employees with entitlement to 12 workweeks of unpaid leave during any 12-month period for the following purposes:
the birth of a son or daughter of the employee and the care of such son or daughter; the placement of a son or daughter with the employee for adoption or foster care; the care of spouse, son, daughter, or parent of the employee who has a serious health condition; or serious health condition of the employee that makes the employee unable to perform the essential functions of his or her positions. Under certain conditions, FMLA leave may be taken intermittently, or the employee may work under a work schedule that is reduced by the number of hours of leave taken as family and medical leave. An employee may elect to substitute annual leave and/or sick leave, consistent with current laws and regulations, for any unpaid leave under the FMLA. FMLA leave is in addition to other paid time off available to an employee
U. S. Office of Personnel Management
FEDERAL EMPLOYEE ENTITLEMENTS
under the FAMILY AND MEDICAL LEAVE ACT OF 1993 (effective August 5, 1993)