First I will say that I wasn't trying to add fuel to any fire and I will apologize to jdg because you are right I did not know your side of it, nor is it my business.... BUT... as living in the same shoes as your son and also having my daughter live in those same shoes, situations like this are so sad for me and I cannot help but put my two cents in....
SO... I will say that it is such a sad thing when parents have to split up but obviously sometimes for the better BUT I don't care who you are and how hard the obstacles are IF YOU BRING A CHILD INTO THIS WORLD (Mom & Dad) you should do everything in your power to see your kid. I get so tired of hearing all of these excuses from Dad's that his ex makes it too difficult to see them... BULLSHIT, you should die trying to do everything in your power.
Also, the child deserves a little more of a reason at that age WHY it's not a good time. I understand if you had no clue he was coming and already had plans to go somewhere without the kids or already had tickets to something that can't be changed but to just tell him it's not a good time because the wife isn't home is not good enough for me and that child will resent him for that.
My Daughter is not my husbands now and I do not check with him if she wants to spend time with us/me or her brother and we weren't expecting to have her at that time. And I would never let him tell me that it had to be any different. I understand you guys are a couple and make decisions together but the child should come first especially if there is already some bonding issues... ya know.
I understand the other kids being sick being an issue... lord knows that stuff can spread like wildfire and get everyone sick.
I am seriously not trying to be mean to either side I just know how bad it hurts to be that little boy and to be the parent in a situation like this too and I really wish you all the best of luck in resolving it so the child(ren) do not have to miss out on any more time without both parents in their lives.
I am sure there is someway to work something out like scheduled visitations or something and maybe even for awhile dictating where they are.
I hope you guys can find something that works for you all... really I do and please know I wasn't trying to be mean to either of you...