Matters can turned ugly when there are interested parties wanting a share of the deceased's estate even if not significant.
My fathers had not much above 100k. He took his posb book when going out and hid it when he is at home

All his children knows know that he had more than 100k in his bank
When he was in his eighties, I told my youngest sis, who my father stayed with, to tell father to convert his posb into joint ownership with her or my younger bro. When he procrastinated I spoke to him personally about converting his account into a joint account. He said not time yet

But alas about 2 years before his death, he asked me to be joint holder of his account in the presence of 2 other children
Do you think as joint holder I got survivorship rights to keep all to myself? I asked him how he like me to distribute or else I would use my discretion. He refused to give an answer
Before converting his account to joint account, I open another posb JA with him for the sole purpose of transferring by giro, his CPF monthly payout. Then from posb, I discovered that my father had another posb account in single name that he had forgotten completely as nothing much inside. Then I converted that account into a JA for the sole purpose of transferring by interbank the monthly cash allowance that I gave. Before that I deposit his monthly allowance in the first mentioned posb account.
When he passed away intestate, he had 3 posb JA account with me and a fully paid up 3 rm hdb in single name
Guess what I did with Letter of Administration?