Based on the symptoms and hereditary pattern, this condition is highly suggestive of Huntington's Disease, a progressive, genetic neurodegenerative disorder. While there is currently no cure, treatments in India focus on symptom management to improve quality of life: 1. Involuntary Movements: Medications like Tetrabenazine and Deutetrabenazine are commonly prescribed and available in India. 2. Weakness and Mobility: Regular physiotherapy and occupational therapy are essential to manage progressive weakness. 3. Supportive Care: Antidepressants or antipsychotics can help manage associated psychiatric symptoms or mood changes. I highly recommend consulting a neurologist for genetic testing (CAG repeat analysis) and genetic counseling for the family.