The term “lonely parent” may seem like a contradiction in terms. Parents, by definition, are inextricably linked to at least one other human, after all—their child. And parents are constantly interacting with other humans: teachers, doctors, coaches, caregivers, and other parents, including, for many, the co-parent. Thus, it’s no wonder that so much of the research on loneliness has focused on groups like the elderly and college students, instead of parents. And yet, according to an O...