All of OJ Simpson’s children involved in the last days before death

OJ Simpson was surrounded by family in the last days before his death, and so were all his living children – yes, even the two youngest he was with Nicole Brown Simpson.

Sources with direct knowledge tell TMZ … anyone who came to visit OJ at his home in the days before he died had to sign non-disclosure agreements for their privacy – that included friends, family and even medical personnel who came into contact with him while he was under hospice care.

On Friday, we learned that a medical professional came to see OJ and informed those around him that he was transitioning – and then everyone flocked to his bedside.

It’s unclear exactly when his four children arrived, but near the end… they were all there as he died peacefully. Family members included his two children with Nicole — Sydney And Justin — and his 2 older ones with Margaret Whitley … Jason And Arnelle.

It may shock some to learn that Justin and Sydney were involved… when their mother was brutally murdered, allegedly by their father.

While Simpson was acquitted of the murder charge, he was later found civilly liable for Nicole’s death and that of Ron Goldman. In the aftermath of all that, OJ raised Justin and Sydney.

They’ve never spoken publicly about the whole saga, so we don’t know how they feel about it. It’s also not clear how close the relationship they maintained with OJ in adulthood was. Sydney is now 38 and Justin is 35.

Aside from family members… we’re told dozens of friends visited Simpson in his final days. As we reported, his remain good friends flew in to say goodbye.

Our sources say that somewhere between 30 and 50 people – made up of friends and other family – saw OJ in person. They all signed the non-disclosure agreement and no phones were allowed in the room with him.

As we told you, he was in very poor health before he died… and couldn’t talk much. Still, these people got some face time with him and said goodbye.