Another idea may be to take a peek at the Grief & Mourning resources on Hoagies Gifted Education Page. There are resources to comfort during loss of loved ones, and also treasured pets.

Parents may also wish to become familiar with existential depression. One resource is this article by James Webb, as found on the SENG website (Supporting Emotional Needs of the Gifted).
Quote
We all need to build our own personal philosophy of beliefs and values which will form meaningful frameworks for our lives.