My parents’ chiding still rings in my head. “Daryn, you need to learn to share your favorite doll and toys with your little sister.” Ah, memories of being 8 years old and being taught to share. Now as ...

Toddlers and preschoolers have a reputation for refusing to share. “No!” and “Mine!” are generally among their earliest utterances, and often their most frequent. While it’s true that most kids need ...