The full answer
Yes — it has a strong genetic component
Celiac disease is strongly genetic, tied to the HLA-DQ2 and HLA-DQ8 gene variants. First-degree relatives (parents, children, siblings) of someone with celiac disease have a meaningfully higher chance of also having it — estimates suggest roughly 1 in 10, well above the general population rate.
What this means for relatives
Because of this, testing close relatives is generally recommended even without symptoms — see should my children be tested and should siblings be tested.
Important context
Individual symptoms, reactions, medical histories, food products, and local labeling rules can vary. Community experiences are not medical evidence.
For personal medical decisions, diagnosis, testing, or treatment, consult a qualified healthcare professional.