If you are concerned about it, then have your brothers wire the funds into your account and then do a tellers or certified check from your account and bring it to the closing.
I'm not sure about the regulations regarding funds in NJ...but the only issue would be if they were escrow funds anyway. I can't see any reason why an attorney would be able to hold onto your purchase funds if the deal doesn't actually close...he doesn't need 'permission' to return those. But, if you are concerned, then just have your brothers wire the money to you and bring the certified/tellers check to the closing. Find out what the maximum you are able to write out of your personal account at closing in case 'extra' is needed for some reason and prepare for that.
And...have a wonderful, stress free closing!