Ex wife invading privacy

My boyfriend shares two kids with his ex wife and she invades his/our privacy. Weve only been dating for about three weeks now,and she has made up a few pathetic excuses to come over and be nosey.. She has the kids Mon-Friday and is supposed todrop them off at my boyfriends house Saturday at 4:00 and then he gets them until Monday morning, then drops them off at Summer camp.

Recently she has been dropping them off on Saturday early morning (they’re not supposed to arrive until 4:00pm) saying “Oh,the kids wanted to come see you,and go swimming.” (he has an inground pool) No big deal.. but she barges in and makes herself at home like she lives there..

Today she came over randomly and walked right in his house up the stairs and made up an excuse that she was “checking to see if she got any mail” when she knows she doesn’t get mail there anymore.. Then she hestitated leaving and started washing her daughters sippy cup saying (I came here to get Kylie(their daughter)’s cup.)

My boyfriend and I both know she is purposely doing this to be nosey but my question is this: What can we do about it?

He said today he wants to put a restraining order on her because she is only supposed to come over when it involves child support or the kids.. She has been coming over whenever she damn well pleases (not the scheduled time when the kids are supposed to be there) and she’s continuosly being nosey,and treats him like they’re still married,and he hates it.

If he does try and get a restraining order will it effect the kids? He doens’t want them involved,only her to back off and let him live his own life in privacy with out her blowing up his phone for reasons other than the kids and coming over when she is not supposed to be..

Please help.