Dependent Visa extension

Hi, I got my parents to China and missed family certificate document with attestation by Chinese embassy in india. i am planning to send the document to india to get attested in passport clearly mentioned need to apply dependent type within 30 days of arrival/entry to china, by the time its already 12 days over for me,if i didn't receive the document in time for my parents what is the solution, is there any grace period to apply after 30 days from arrival, please help me to overcome this matter.

I cheked with India Chiense emabassy and they said it will take minimum 10 working days to complete this process