It doesn’t mean you’re vulnerable or easy to break. Quite the opposite, actually. Amber Boone tried to raise her children without playing favorites or making anyone feel overlooked. But over time, the needs of her youngest son took a back seat to those of his older sister. Boone’s son became the family’s “glass child.” That doesn’t mean he was vulnerable or easy to break ― quite the opposite. Though not a formal diagnosis, a “glass child” is someone who grows up with a sibling whose mental,