In families raising a neurodivergent child, there is often another child standing just off to the side, easy to miss because they’ve made themselves that way. Therapists and researchers have started calling them glass children, a term credited to Alicia Meneses Maples, who grew up alongside a brother with autism and another with a terminal illness. She described it this way: parents are so consumed with the needs of the child with disabilities that when they look at the other siblings, they look right through them as though they were made of glass.
The name is often misunderstood. Glass children aren’t fragile. They’re transparent, because they’ve learned that what’s happening inside them doesn’t draw attention, so they stop showing it.
This isn’t a matter of parental choice or neglect, or loving one child more than another. It’s a dynamic that forms out of sheer bandwidth. When one child’s needs are loud, urgent, and physically present, in a meltdown on the floor of a store, in a crisis that can’t wait, the other child’s needs, quieter and less visible, get deprioritized in the moment, even by parents who love both children equally and would never choose one over the other.
What makes this especially easy to miss is that the neurotypical sibling often looks fine. They may become high achievers. They may take on a caretaking role in the family, monitoring their sibling’s moods, trying to head off escalation before an adult even notices it starting. They may answer “it’s fine” every time the topic comes up, because fine is the fastest way to end a conversation that feels like it’s asking them to carry something they don’t have language for.
Underneath that composure, researchers describe a nervous system that has adapted to survive rather than thrive. The child learns to self-regulate alone, because there’s rarely support available when they’re already stretched managing a sibling’s needs. Emotions get suppressed rather than processed. What looks like resilience is often a survival strategy, one that isn’t sustainable indefinitely.
A striking illustration of this comes from an episode of the podcast Where Should We Begin, hosted by therapist Esther Perel, titled “To Make Room For My Brother, I Learned To Disappear.” A young woman describes spending her childhood shrinking herself so there would be room for her autistic brother, feeling guilt over ordinary milestones he might never reach, and even, as an adult, mentally managing his behavior. Perel offers her a single line that reframes the whole pattern: “The weather changed, but you haven’t taken off the sweater.” The nervous system, once shaped by years of unpredictability, keeps bracing for a storm long after the storm has passed.
The encouraging part of this research is also the most important part: what gets encoded in a developing nervous system isn’t permanent. Neuroplasticity means these patterns can shift, through connection, through consistent and non-contingent attention, and through naming what’s happening without asking the child to manage it themselves. Recognition, not fixing, is often the first and most powerful intervention. When a sibling hears “I see what this is like for you, and it isn’t your job to hold it,” their nervous system gets a small, repeated signal that it’s safe to stop bracing. Over time, that’s how the sweater finally comes off.