Empathy is the precursor to compassion, and its only when we experience empathy that we can be compassionate. Parents are integral in teaching a culture of learning to respect others' feelings and helping young children to develop empathy.
Sadly its a fact that many preschoolers will be exposed to some form of loss and grief in their early years. Whether its when a pet or someone close dies, if their parents separate or a good friend moves away. Toddlers and preschoolers dont really understand how the world works, so how do we explain loss and grief to them?