This discussion explores the validity and enforceability of unregistered family settlement MOUs, particularly concerning clauses that prohibit signatories from challenging the terms in court. While some argue such clauses are void against public policy, others suggest that even unregistered agreements can be binding through the principle of estoppel if acted upon. The impact of a signatory's death on the MOU's validity and the possibility of executing a new agreement are also discussed, with experts clarifying that legal heirs are generally bound by existing terms unless a new settlement explicitly cancels the old one.