From Singapore to Indonesia and Thailand, the confrontation in the "first family" shows that siblings can also divide in politics.

Rachmawati Sukarnoputri, a 69-year-old Indonesian politician, was born into a family of two presidents.

However, Rachmawati always criticized her sister.

Last month, Lee Hsien Yang, brother of Singapore Prime Minister Lee Hsien Loong, also joined the opposition Singapore Progress Party (PSP) after the country's parliament dissolved to make way for the early general election on July 10.

The confrontation of siblings among the ruling elite in Southeast Asia has always attracted the attention of the public.

Abuza says all cultures have political families.

However, the serious rift that divides families, made siblings and house-owners decide to stand on different fronts, not only within the political framework, Abuza said.

"They are almost like the Kennedy or Bush versions of Singapore," Tan said of the family of former US presidents.

The "civil war" of the Ly family related to the fate of their father's house, the late Prime Minister Lee Kuan Yew.

Tan said many Singaporeans consider the Prime Minister's younger brother to join the opposition party as a trigger for the big war, adding that some of Li's comments criticize how the government operates most people.

However, Tan stressed that there should not be any link between the brothers' dissent and the Ly general election in Singapore, because the country's future is facing challenges.

In Indonesia, the difference between the Sukarnoputri sisters is thought to be more personal than ideological, says Dodi Ambardi, lecturer at Gadjah Mada University in Indonesia.

Rachmawati is friendly and able to speak.

Former President Megawati became famous in the early decades of that decade, when she was forced to leave the seat of the Democratic Party of Indonesia (PDI) by Suharto's military government.

Meanwhile, Rachmawati did not achieve much success in other political parties before joining Gerindra.

The siblings facing confrontation also appear in the Thai royal family.

However, King Maha Vajiralongkorn, her younger brother, criticized the decision as "inappropriate", and ordered her to stop running for election because the move "went against traditional traditions, customs and culture."

Professor Abuza called it "a fascinating incident", pointing out that Princess Ubolratana supports democracy and disagreements with Thailand's military government.

However, the political confrontation between siblings will hinder or promote democracy, as well as the development of politics, depending on the country.