1st, big hugs and well wishes to your and lil one, mine just gave me a heart attack last week and spiked a high fever and had a seizure, i understand how you feel 100%, I never left her side, not even to eat, my hubby brought me food, clothes, I washed myself up in the bathroom etc.
1st off, take a deep breathe, believe me I know at times you reeealllly want to flip out and its hard to not stoop to their level but lets look at reality for a second here...
1-you have sole legal and physical custody and dad has parenting/visitation time correct? This is court ordered in writing yes? On that stand point alone, you are the only one to call the shots, if you request hospital security to remove anyone you do not want present OR is causing issues, legally they must follow this request b/c then it becomes a public safety issue to OTHER PATIENTS at the hospital. Legally only dad has a right to visitation not anyone else so they can blabber all they want, its NOT going to happen.
If the hospital was to be stupid enough to let just anyone in to see a child in ICU or anywhere else for that matter, they are opening up themselves for a HUUUUGE lawsuit by blatantly disregarding a parent's legal rights as the guardian to their minor child, especially with a bonafide court order in effect AND if it affecting the care and well being of other patients. Do you really think that other parents there are going to want to see or hear drama while they have their children's health issues at hand like you do or that the hospital administration want complaints from other patients as well? of course not but if they step family gets stupid, they will most likely get tossed out of the building.
2-Hospitals and pediatric departments have strict regulations and rules to follow due to the vulnerability and delicacy of their little patients,especially in intensive care units etc. The patients well being supercedes that of anyone else. If they already laid out the rules to you, get them in writing and if the step family shows up on saturday and acts ridiculous, they legally can be removed from the hospital property, you keep this with you if it ever goes to further litigation.
I would like to assume that no court will hold a parent in contempt of their court order b/c a legal stranger demanded access to a child that is not theirs, even if dad was to be stupid and try to say that, you have hard core documentation of where your child was, that the rules were etc. But you are not doing that at all,you are not denying or stopping dad from seeing his child on his visitation time either.
I know its going to be hard but keep calm, cool and collected, make sure you have a copy of your court order that shows you are the only one legally entitled to make any/all decisions for your child. If dad's new wife tries to get him to overstep his legal boundaries then you will have no choice but to request the parties to be removed from the building. Any lawyer worth his salt or at least an honest one will see the hospital policies and the existing court order and should advise his client this is a BAD idea.
Just my 2 cents, good luck and let us know how kiddo is doing.