I have a question regarding family reunion visa.

My wife and child will apply for a family reunion visa. Should they also submit my home contract, job contract and salary slips …or I would be supposed to present after being later called by local office.
In the case they submit these things; can it make the process faster (Local office may not call me hence saving process time)?
Regards

yes. the applicant has to submit their spouse's documents such as home contract, job contract and salary slips at the time of visa application in India. you may or may not be called by your authorities in Germany for verification.

find the check list of documents here...i hope it is same for all the consulates in India.
http://www.chennai.diplo.de/Vertretung/chennai/en/Formulare__RK/Visa/download__visa__InfosheetFamilyReunionSpouses,property=Daten.pdf