[1] The testator had three sons, Tob Chee Mun, Tob Chee Choong and Tob Chee Hoong. Choongs children Tob Weng Keong ("Keong") (1st plaintiff), Tob Weng Kin ("Kin") (2nd plaintiff) and a daughter have always lived with their grandfather and grandmother together with Muns wife and daughter up to the testators demise.

[2] On 30 July 2013, the testator had been admitted to Institut Jantung Negara (IJN) for an operation. On 13 August 2013, the testator made a will under which Keong and Kin were appointed as the executors and beneficiaries under the will. The will in question was prepared by the family lawyer Ashok Kumar Puri ("Ashok").

[3] A heart operation was performed on the testator on 14 August 2013. Unfortunately, the testator succumbed to post operation complications and passed away on 3 September 2013. The testator was survived by his wife Teo Ah Chai @ Kor Mui Lai (who passed away subsequently on 21 February 2016), his three sons and grandchildren.

[4] After the testators demise, Keong and Kin filed an action at the High Court for a declaration that cl 2 under t