"Since Lee Kuan Yew's death, Lee Wei Ling has occasionally let loose on her brother on Facebook so we know that there's some unhappiness there but this public statement is a very public demonstration and evidence of the rift in the family", Han says.
They added that they feared "the use of the organs of state against us" and that Hsien Yang felt compelled to leave the country. I have no desire to leave. "Hsien Loong has everything to gain from preserving 38 Oxley Road".
It is the second time in 15 months that the issue has exploded into public view.
"We are private citizens with no political ambitions", the siblings said in a statement. The authoritarian city-state, which won its independence from Malaysia in the 1960s, has very strict laws regarding free speech and the media.
"I generally avoid commenting on Singapore politics, but this is an exception".
The Lees are the children of Lee Kuan Yew, Singapore's revered founding Prime Minister who died aged 91 in 2015 after a political career spanning over five decades.
And while the feud is yet to be resolved with the Prime Minister being away with his family on holiday, experts from the marketing and branding world think that despite global media coverage, this incident wouldn't really have much of an impact on the country's overall image.
Dr Li Shengwu, the eldest son of Mr Lee Hsien Yang affirms in his Facebook post, the perceived threat that his family faces.
At the heart of the family dispute is the future of the house in which their father, Lee Kuan Yew, lived for most of his life. He was authentic and spoke his mind.
Wei Ling and Hsien Yang said they were "disturbed by the character, conduct, motives and leadership" of their brother, and expressed concern that "the system has few checks and balances to prevent the abuse of government" and that "big brother [was] omnipresent".
Lee Hsien Yang, who is chair of Singapore's aviation authority, told the BBC he would "leave Singapore soon" and was "looking at a number of options" on places to move to.
"We believe, unfortunately, that Hsien Loong is driven by a desire for power and personal popularity".
A long-running feud among the family of Singapore's prime minister over the legacy of their father, the country's first leader, has resurfaced.
In this photo, taken March 29, 2015, the family members of the late Lee Kuan Yew arrive with his portrait at the start of the state funeral at the University Cultural Center in Singapore.
They said that unlike their mother, who acted outside the limelight as a private adviser, Ho Ching had amassed huge influence that extended "well beyond her job purview". "While Ho Ching holds no elected or official position in government, her influence is pervasive, and extends well beyond her job purview".
"While siblings may have differences, I believe that any such differences should stay in the family".
The statement from the Cabinet Secretary was issued in response to claims by Mr Lee Hsien Yang and Dr Lee in their statement that PM Lee made "extensive representations" to the committee and that he is in "a direct position of power over the committee" because the ministers in the committee report to him. The statement made by the Prime Minister on Facebook, resulted in over 2200 shares in just four hours of being published, with many showing support for how the issue was surfaced.
"Ho Ching and I deny these allegations, especially the absurd claim that I have political ambitions for my son". On the first anniversary of their late father's death, Singapore's Channel NewsAsia reported Wei Ling had accused Hsien Loong of "abusing his power", and that the government was trying to "hero worship" Kuan Yew.
"I will do my utmost to continue to do right by my parents. In particular, that means upholding meritocracy, which is a fundamental value of our society", he said. Among those attending the funeral will be Southeast Asian heads of state and Prime Ministers Narendra Modi of India and Tony Abbott of Australia.