Allegations of sexual assault by an heir to a beer fortune against his own older brother have thrust one of Thailand’s richest families into an uncomfortable spotlight, stunning a public unaccustomed to seeing prominent households air their affairs in public. The scandal erupted last week when Siranudh Scott, better known as “Psi” – a fourth generation heir to the Bhirombhakdi family’s beer-to-real estate empire – shared allegations of historic sexual abuse by his older brother, Sunit, on...