Role Specialization and Jealousy

Role specialization is a robust way to limit jealousy. If dads have different parental roles than moms, then my kids could like me best as a dad, and their mom best as a mom, and I less have to fear that they will substitute her for me. If I teach a particular course well, then my students can like me for being good at my course, and others for teaching their courses well, and I need less fear that few students will want me to teach them.

Robin Hanson, "On Friend Jealousy"