O.J. Simpson was surrounded by family in the final days before his death, and that includes all of his living children -- yes, even the 2 youngest he had with
Nicole Brown Simpson.
Sources with direct knowledge tell TMZ ... everyone who came to visit O.J. at his home in the days before he passed had to sign NDAs for his privacy -- that went for friends, family and even medical personnel who were coming into contact with him while he was under hospice care.
We're told on Friday, a medical professional checked on O.J. and notified those around him that he was starting to transition -- and that's when everyone came flocking to his bedside.
It's unclear exactly when his 4 children arrived, but by the end ... they were all there as he died peacefully. The family members included his 2 children with Nicole --
Sydney and
Justin -- and his 2 older ones with
Marguerite Whitley ...
Jason and
Arnelle.
It might shock some to hear that Justin and Sydney were in the mix ... as their mother was brutally murdered, allegedly by their father.