ur siblings not malaysian anymore, cannot hold the property via normal love & affection transfer (inherit now while your mum is still alive), but can do so under probate (after your mum passes).

if no intention to keep the house for own stay, sell it under ur mum's name, no tax payable under RPGT.

if inherit via probate, if sell within 5yrs kena tax RPGT.

all properties are subject for RPGT, currently if u hold the property for more than full 5 yrs (means sell during 6th year) then RPGT is 0% for malaysian citizen/PR. doesn't apply to foreigner & companies.

each malaysian citizen have once in lifetime waiver for RPGT (eg. if u sell within 5 yrs n is subject to RPGT), however it must be a residential property and u need to have water/tnb bill under ur name dated prior to the date of sale to prove

why cannot have water/tnb in ur name?

once u inherit, u can just go change the water/tnb account, then only sell it and utilize the waiver.

they just need to see the account owner is urs (tnb/water) on the date before you sell.

to qualify for the waiver, it is expressly stated in the RPGT form that you need to have the tnb/water bill registered under your name dated before the sale.

not much difference in costs tbh

if that property is the ONLY property ur mum has, then transferring it now is cheaper than will, because for the probate u literally dont need to do anything if your mum died with zero assets, or you have the account passwords for your mum's bank account and can transfer the money out urself.

if she totally has no other tangible assets u might not even need to go for probate (cost about 5-8k for the probate, and excluding any property transfer transactions after probate obtained)