You can usually attend a PIP assessment with your family member if they agree, and you may help explain how their condition affects daily living and mobility. The assessor will normally want to hear from the claimant directly, so be honest about when support is needed rather than answering on their behalf throughout. Tell the assessment provider in advance if you need an interpreter, reasonable adjustment or permission for someone to join by phone. If your family member cannot manage the claim themselves, ask the DWP about becoming an appointee and check the latest guidance on GOV.UK.