As families, assets, and business interests become increasingly international, succession planning is growing more complex. Different jurisdictions often apply conflicting rules on inheritance, matrimonial property, taxation, forced heirship, trusts, and the recognition of wills, creating uncertainty and the potential for disputes. Private client advisers must navigate overlapping legal systems, determine which laws apply, and coordinate planning across multiple countries to ensure clients’ intentions are respected. The growing mobility of individuals and wealth makes cross-border succession and conflict-of-laws issues a central challenge for modern private client practice.