Jasminder Singh, 62, head of the Radisson Blu Edwardian hotels empire, is being sued by his father Bal Mohinder Singh, who accuses him of abandoning the Sikh tradition of sharing family property by excluding him from the business.
The younger Singh is said to be worth around 415 million pound, but the dispute is said to involve 50 million pound.
Singh senior said the case is not about the money but about tradition and his son's failure to abide by the ancient "Mitakshara" system, which implies a sharing of family wealth.
Giving evidence, he said he was unhappy about the 800 million pound hotel group's decision in 2010 to remove him as a director.
Singh senior replied "yes".
Judge Sir William Blackburne is being asked to decide as a preliminary issue if the family property is subject to any constructive trust under English law, and if so what the terms of such a trust were.
The father has previously said he started Jasminder on the road to his millions by funding his initial ventures after selling his nightclub in Kenya and starting a post office in Stamford Hill.
