Explainer: Why are Singapore's first family feuding?

FILE PHOTO: A view of former Prime Minister Lee Kuan Yew's Oxley Road residence in Singapore June 14, 2017. REUTERS/Edgar Su

SINGAPORE (Reuters) - A public rift between the heirs of Lee Kuan Yew, Singapore's modern day founder, has shot to the fore with the prospect of his two sons squaring off at a July 10 general election.

Lee Hsien Yang on Wednesday formally joined a new opposition party competing against his brother Lee Hsien Loong's People's Action Party, which has ruled the city-state since its independence since 1965.