Yareth

The answer is yes, you do have to mention it and include certified copies of all court and police records. The form states it quite clearly at the start of Part 3:

"NOTE: These criminal information questions must be answered even if your records were sealed, cleared, or if anyone, including a judge, law enforcement officer, or attorney, told you that you no longer have a record." 

and:

"Have you EVER been arrested or convicted of any of the following crimes: 
 
2.a. Domestic violence, sexual assault, etc."
 
 
and:

"NOTE: If you were ever arrested or convicted of any of the specified crimes, you must submit certified copies of all court and police records showeing the charges and disposition for every arrest or conviction. You must do so even if your records were sealed, expunged or otherwise cleared, etc"
 
 
Please read the forms very very thoroughly and attentively. Your answer is right there.

Also, please fill in your timeline when you've filed. 

The answer is yes, you do have to mention it and include certified copies of all court and police records. The form states it quite clearly at the start of Part 3:

"NOTE: These criminal information questions must be answered even if your records were sealed, cleared, or if anyone, including a judge, law enforcement officer, or attorney, told you that you no longer have a record." 

and:

"Have you EVER been arrested or convicted of any of the following crimes: 
 
2.a. Domestic violence, sexual assault, etc."
 
 
and:

"NOTE: If you were ever arrested or convicted of any of the specified crimes, you must submit certified copies of all court and police records showeing the charges and disposition for every arrest or conviction. You must do so even if your records were sealed, expunged or otherwise cleared, etc"
 
 
Please read the forms very very thoroughly and attentively. Your answer is right there.

Also, please fill in your timeline when you've filed. 

USCIS tends to jump around a lot when going through their backlog.
So they might not do the entirety of petitions filed in november at the same time.

for my fiance and I, we did a lot of talking about future plans and such while we were waiting. Not sure if it helped but it definitely made the time go by lol
 
we also had him come visit while waiting to hear anything, that helped quite a bit.