Do this, put each application in its envelope, and put all 3 envelopes in a large envelope, and send it.
I agree with Al Southner. That's exatly what I did for our N-400 applications (husband and wife). They scheduled us for all steps (FP, interview & oath) at the same time & place. We received USCIS letters/communications in the mail at the same time.
Good luck!
______________________________________________________________________
07/29/2010 (Day 1) USPS Express mail
07/30/2010 (Day 2) Mail Forwarded to Dallas 75266 (Lockbox)
08/01/2010 (Day 4) Application Received
08/02/2010 (Day 5) Priority Date
08/05/2010 (Day 7) Money Order Cleared (Cahsed)
08/09/2010 (Day 11) NOA rec'd
08/11/2010 (Day 13) RFE Date
08/13/2010 (Day 15) RFE Email received
08/16/2010 (Day 18) FP Notice Rec'd
08/25/2010 (Day 27) FP Done & Photos taken
10/07/2010 (Day 70) Case transferred to Local Office (Durham, NC)
10/09/2010 (Day 72) Interview Notice recv'd
11/10/2010 (Day 102) Interview Date
11/10/2010 (Day 102) OL handed over right after Interview
12/10/2010 (Day 132) Oath Date
