Dyadic Mindfulness for People With Parkinson's Disease and Their Caregivers

Inclusion Criteria of PwPD: * Chinese patients with idiopathic mild-moderate PD (as indicated by the Hoehn and Yahr Scale stages I-III: those with unilateral/bilateral symptoms, with/without postural instability who are able to walk/stand unassisted) * Aged ≥18 years Inclusion Criteria of caregivers of PwPD: \- Self-identified as the primary caregivers of their patient Either patient or caregiver needs to experience at least mild negative emotions (as indicated by the 21-item Depression, Anxiety and Stress Scale \[DASS21\] score of Depression subscale ≥10, Anxiety subscale ≥8, or Stress subscale ≥15) Both need to be able to communicate in Cantonese and provide written consent. Exclusion Criteria: * Engage in regular supervised mind-body practices such as Tai Chi, yoga, or other forms of mindfulness training (\>2 times per week) * Have a pre-existing acute psychotic disease * Currently participating in any other behavioral or pharmacological trial * Have significant cognitive impairment, as indicated by an Abbreviated Mental Test score≤ 6 * Have other contraindications that may limit their full participation (e.g., severe hearing/vision impairment)