Playing devils advocate - so what that your family can't send things direct? Why should that worry W?
I'm with Toots - I'm not sure what you mean by taking care of it with Royal Mail. Can a person be registered at 2 addresses?
Could you say (not sure that text message is best format): I got a leter confirming post rediection for you and the kids. I would like for kids to retain an address at my house so my family can continue to post to them directly. They are after all with me more than 40% of the time. Going forward, can we please discuss things before we make changes. Thanks.
H 37 Me 36 Together 15 years Married 5 years No kids BD Apr 2014 H moved out 2 Jun 2014