Thanks Bryanna for the advise.....VFS India will not accept the passports of your family members if they have not received passport request letters.
Your processed passport with the visa will be returned well before your flight to the US. I would include copies of the confirmed flights + a letter requesting for expedited visa stamping when you submit your passport to VFS Delhi.
I wouldn't risk submitting the passport in the US because it is a bit complicated, not a straightforward process like it is for VFS India. BTW you must submit your passport to the nearest VFS, not necessarily to VFS Delhi
Can I take the route you shared with @Mrmoody90 in the other thread.....!.
What is your opinion on the advise shared by Amodmallya above!!