I am new to this forum so please be gentle

I would like to understand if there are any issues in apply for LTVA for both my Mum and my Mother in Law for the below reasons.
- My Mum is currently undergoing clinical trial in a Hospital in Singapore and she would like to obtain LTVA for the very purpose of being in SG for treatment. She is a Malaysian.
- I would like to get my Mother in law in Singapore to assist us in taking care of our Newborn child. She is from China.
Any help would be greatly appreciated!! Thanks again!!