Dyslexia is hereditary. It’s a genetic, neurobiological condition that affects parts of the brain responsible for language, inherited from parents that also have the condition.
Even in situations where young children or adolescents have dyslexia but their parents don’t, remember that it all depends on whether or not the language-based learning difference or learning disability was diagnosed. Many individuals, especially older adults, may have lived with a learning disability but never had the opportunity to benefit from the right diagnosis or approach to help them properly learn.