“The principles of testamentary capacity are well settled: a testator must understand the nature of the act of making a will, the extent of the property of which he is disposing, and the persons who may have a claim upon that property: Banks v Goodfellow (1870) LR 5 QB 549. Further, the proposed dispositions must not be poisoned or influenced by any disorder of the mind.”
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New Square Chambers, June 2013
Source: www.newsquarechambers.co.uk