“Hernando Villa: A Sri Lankan Love Story” by Terrence Perera
The book is about the upper class Hernando family living at Goratuwa, a town in Sri Lanka. With this family as the central focus of the book, stories are also told of people connected to the Hernando family – their Tamil friends whom they saved during the 1983 race riots and their Sinhalese friends who had an inter-caste, inter-religious marriage.
The love story is between Nihal Hernando and Padma Rajaratnam. Padma is sent by her parents in Canada to Sri Lanka to get herself a suitable husband: a husband who is Jaffna-Tamil, high-caste and Hindu! Nihal’s parents want him to marry a Sinhala, Christian girl of the same caste as themselves.
The book deals with how both families initially vehemently oppose this love affair, but eventually give in and consent to the marriage. https://www.amazon.com/author/terrenceperera