O very simply. We had these encouragemen visits go over us just like that. Let them take the lead. They will probably want to read a scripture or two, asking your wife to read them and for commentary, ignoring you being the head of your family. Then they will probably want to make some appointment to do some witnessing, like coming saturday. Your answer is not a glaring no, but something to the effect of thank you brother, we will consider these things under prayer. (Hasta la vista, baby)
That's most likely it.
But what if your wife starts to bring up your critical attitude. That's what happened to me you see. In such a case, you are screwed! Depending on what you want to achieve you might want to chose to give them a real blast or be as non-judgemental as you can be and trying to convey your being willing to give the advantage of doubt.
I gave them the full blast in such a way, that there was no denying, but I always kept it friendly and forthcoming. So the end of the story was that they just had to accept it as a given and that I was not "yet ready" to return to the fold ....
Anyways, you can have a real good time when it comes to this. Prerequisite is that you are at peace with where you are now. Any anger and negative emotion towards the borg is not very helpful, unless of course you want to skin these guys ....