The U.S. Department of Labor (DOL) has expanded its scope of the Family and Medical Leave Act (FMLA) to allow employees to be allowed unpaid leave to care for the children of unmarried same-sex partners, but does not extend this unpaid leave to care for ill unmarried same-sex partners. This research brief uses data sources to estimate the number of families currently affected by the new ruling and those that would be affected if the FMLA expanded these rights to unmarried same-sex partners.