Nancy Kerrigan's Brother Allowed to Live w/ Mom

Nancy Kerrigan's brother -- who faces charges of assaulting his father -- will be allowed to live with his mother after posting bail.

The judge changed the terms of Mark Kerrigan's bail this morning ... if he posts $10,000 bail, he can move back into the family home with his mom. The D.A. objected to the change, to no avail.

We're told if Mark posts bail, he'll have to wear a GPS monitoring bracelet and he can only leave the house for limited purposes.

Mark will also have to stay sober, and submit to random drug and alcohol testing.