The test for whether a person is under a disability for the purpose of conducting litigation is issue-specific: the person must be capable of understanding, with proper explanation, the issues on which consent or decision is likely to be necessary, including compromise. The capacity required is assessed by reference to the complexity of the particular proceedings, not by reference to the person's capacity to manage other affairs or conduct simpler litigation. The burden of proof lies on those asserting incapacity. Vulnerability to influence and emotional decision-making are relevant but not determinative factors.
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