Regards vist visa for parents

Assalamu alaikum,
        I had a question regarding vist visa for my inlaws(father-in-law & mother-in-law).
    Currently i am in india for my annual vacation with my wife, i want to bring her father and mother, could i apply visit visa from india or i have to come back and then apply????
If i apply from here what's the duration to submit the documents when i arrives...
In the second case if i have to apply after i come back to ksa then is it compulsory my wife also come back or she can stay more in India, i cany apply directly to bring both of them after visa approval....
Please let me know if somebody had this information....
Thanks

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