“The sons, Roger and Brian, claim that the sale of 270 films under their father’s New Horizons Picture Corp banner – which they refer to as ‘stolen film properties’ – violated an irrevocable trust agreement that would have provided them and their two sisters with $30 million-$40 million each. They are also suing [purchasers] Ace Film and Shout! Factory, claiming they ‘knew or should have known that the purported sale of the New Horizons catalog included film properties owned by the trust.'”