Hello,
Like other members suggested, pl talk to the concerned HR AND ALSO your boss.
Next step, mail the scanned copies of the medical reports, bills, etc to your boss & HR putting across your request for extension of NP.
As long as the HR & your boss are convinced that this is a genuine case & NOT some story made-up for whatever reasons....which can be done by just speaking the truth & laying ALL the facts on the table.....you shouldn't be worrying.
And what does this line mean ".........so it may be quite a while before I can get back to putting in the documents"?
What's being suggested in this Forum is to submit the relevant Medical Bills of your mother's treatment........I am sure you are where your mother is....right?
IF you are referring to the process of SUBMISSION to Wipro, then you already have the alternate way....MAIL to them AFTER speaking & explaining over phone.
And also inform the situation about delay in getting relieved to your new Company........they need to be prepared your delayed joining.
BTW, not being registered with NSR has nothing to do with this case.
Rgds,
TS