Adjustment of Status - I-485

I married my husband in 2012 whom is a GC holder that time and we had a baby in late 2012 , after which i stayed here being out of statues till this year my husband became a US citizen and hence filed the I485 for me ,

My question is will they ask about my overstay and whether we must have some joint bank accounts/credit card etc as we don't have any. We only file tax together.
I reckon our son is the best evidence we have , together tonnes of family photos ,Facebook , social media etc

Any tips for the interview ? Should i bring our son there?

Thank you in advance and wish everyone out there good luck !!!

my USCIS timeline

4/23/16 sent all the forms package to Chicago Lockbox (I130, I485,I765,I864, I693 etc ) via USPS express mail .
Did all the form by myself without engaging any lawyer.
( day 1 )

4/25/16 USPC statues parcel was sent to Chicalgo ( day 3)

5/2/16 received both sms text and email notification of receipt and it was accepted and will be sent for processing (day 10)

5/2/16 check cashed for USCIS(day10)

5/7/16 receive all mailed receipts in hard copy ( day 14 )

5/12/16 Managed to search for my case statues online in USCIS website ( day 19)

5/14/16 received in mail of notice for biometrics appointment for 5/26/16
(Day 21)

5/17/16 successfully did a walk in biometrics today ! (Day 24)

6/2/16 received letter from USCIS asking for more evidence (day 40)

6/8/16 sent via express mail to submit the requested evidence of documents (day 42)

6/13/16 updated from USCIS website that they received my response for request for evidence and will continue to work on my case . (Day 47)

7/12/16 updates from USCIS website that they approved my I765 application and also ready to schedule for interview and I will receive a letter soon
(Day 77)

7/20/16 received my EAD card in mail
( day 85)

8/12/16 received updates from the USCIS website that they mailed my letter for my interview scheduled for September 14th (day 108)