Most probably you need to have a photo-copy both side of NRIC,
and have to bring the Original NRIC and Letter of Authorization with your Mother signature.
Re-contract should not have much issue if you take the nec documents as describe.
For New Sign In = No.
Your Mother must be present.
Also, this include if you are taking over the ownership.
Just my experience.
If there is any changes, i won't know.