Triggering events occur; 120-day letter is mailed and siblings are surprised at their being disinherited; trust has disproportionate allocation of assets or requirements to sell assets to which siblings have an attachment; assets go into trust or to charity; well-to-do children get less than worthless scion.
All resulting in disharmony and potential court disputes.
Transparency with children – full discussions during life as to desires
Taking measures to assure competency against a contest
Detailed communications with the trust as to how decisions were made
Lifetime disproportionate gifting and methods to re-allocate at death