Refinance issue when co-owner of a HDB passed away

Hi Guys,

Currently i co-owned a HDB flat with my mum and dad based on tenancy in common (TIC) where each one of us held certain percentage of shares. As my mum passed away recently without a will, my dad has applied for the grant of letter of administration as the administrator and has been approved by the court.

I have a few issues below which I would like to seek advice from the floor:

1. I understand that the my late mum's share will need to be distributed to my dad, myself and my brother (who currently stays in another HDB flat he owns by himself) based on the intestate laws (since she didn't prepare a will). As my brother is prepared to renounce his portion share from my late mum because he currently owns another HDB, can our flat ownership still remain as TIC by redistributing the percentage of share between my dad and myself (including the renounced share of my bro) upon completing the transfer of deceased's property process with HDB?

2. The second issue is the mortgage loan. I have checked with my current and was told that I would not be able to do repricing and will need to engage a lawyer to lodge a notice of death to the bank and apply for a new fresh loan. However, I understand some banks will only accept loan application more than $200K and my ongoing mortage loan (interest rate of 1.8%) lock in period will be expiring in a few months' time, my outstanding loan will be less than $200K till then, is it possible to buy over a certain percentage of my dad's share to increase the loan value to slightly more than $200K and get a fresh loan from the bank on this basis?

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Apologies for the lengthy post 🙏😅