A single-parent family is a family where there is one parent raising the child/children. Another term that can be used for a single-parent family is a solo-parent family. Another way to describe this kind of family could also be a one-parent household. Separated families can sometimes be referred to as single-parent families, but another term that is used to describe a family where the parents are not living together is a co-parenting family. A lone parent family is another synonym for a single-parent family. Finally, another option could be to use the phrase singular parent family to differentiate it from a two-parent family.