In the wake of the brutal double-murder of Nicole Brown Simpson and her friend, Ronald Goldman, on the night of June 12, 1994 -- with a large swath of America and beyond unambiguously convinced to this very day that it came at the hands of O.J. Simpson -- the Brown family mounted a colossal effort to shield the former couple's two young children from what transpired that night and in the ensuing years.

Nicole and O.J.'s kids -- Sydney and Justin -- were only 8 and 5 years old and sound asleep upstairs in their mother's Brentwood, California, home when she was stabbed to death.

Nicole was 35. Ronald suffered equally brutal stab wounds. He was 25.

But like a herd forming a protective circle to protect its young from harm, the Brown family mustered the strength amid the horrifying circumstances and rallied around the two children and valiantly kept them away from the limelight. ET's Rachel Smith spoke with Nicole's three sisters -- Denise, Dominique and Tanya -- ahead of the 30th anniversary of Nicole's death, which is the subject of a new Lifetime documentary, The Life and Murder of Nicole Brown Simpson , a two-night event premiering June 1. The trio opened up to ET about how the Brown family protected Sydney and Justin from the media circus, how they reacted to O.

J.'s death and how the children -- now adults with families of their own -- are coping all these years later after Nicole's death and O.J.

's sudden death on April 10 following a battle with cancer. He was 76. "Well, f.