The phrase "married parents" refers to a situation where a husband and wife are legally married and are raising a child or children together. Full definition
But it is important to try and understand why the children of married parents do better. (brookings.edu)
I grew up in a home with married parents who stayed that way until my mom's death. (rolereboot.org)
In other words, children of continuously married parents do not outperform other children just because their parents show better parenting behavior, but it does play a large role in the marriage gap. (brookings.edu)