AT KENSINGTON PALACE.
>> DIANA'S GREATEST LEGACY HAS
TO BE HER SONS.
YOU CAN SEE HER IN ALMOST
EVERYTHING THEY DO.
WE FOUND EARLY FOOTAGE OF HER.
>> HE'S NOT AT ALL SHY AND VERY
POLITE.
VERY MUCH AN ORGANIZER, WHICH
WILL HELP IN FUTURE YEARS.
WHERE PERHAPS HARRY IS MORE
XWOO
QUIET AND WATCHES WILLIAM.
WE'LL SEE BUT HE'S A DIFFERENT
CHARACTER ALTOGETHER.
>> Reporter: THEY ARE
UNMISTAKABLY DIANA'S BOYS,
WILLIAM AND HARRY, BORN TO A
PRINCESS WHO PROFOUNDLY CHANGED
WHAT IT MEANT TO BE ROYAL.
>> DIANA WAS AN ABSOLUTELY
PIVOTAL FIGURE IN RECONFIGURING
MONARCHY AS WE KNOW IT.
SHE COMPLETELY MODERNIZED IT.
SHE MADE IT MUCH MORE TOUCHABLE.
SHE MADE ROYALS MUCH MORE
ENGAGED WITH THE PUBLIC.
>> Reporter: KENSINGTON PALACE
IS ONCE AGAIN WILLIAM AND
HARRY'S ROYAL RESIDENCE.
IT'S WHERE THEY GREW UP UNDER
THE WATCHFUL EYE OF THEIR
MOTHER.
D
>> DIANA ALWAYS WANTED THEM TO
HAVE AS NORMAL AN UPBRINGING AS
POSSIBLE.
>> Reporter: BACK THEN HE WAS
BODYGUARD TO DIANA AND THE
PRINCES.
>> THEIR APARTMENT'S THERE AND
HARRY WOULD COME OUT AND PLAY
AROUND HERE.
OF COURSE, THE PUBLIC WOULD SORT
OF OFTEN DO A DOUBLE TAKE AND
SAY THAT LOOKS LIKE HARRY,
WHATEVER.
>> Reporter: THEY COULDN'T
BELIEVE.
>> THEY COULDN'T BELIEVE THEY'D
ACTUALLY BE PLAYING IN A PUBLIC
PARK.
>> Reporter: OFTEN FORGOTTEN
PICTURES FROM THE TIME SHOW
DIANA TAKING YOUNG WILLIAM TO A
MOVIE THEATER.
>> THE SHOPS AND THE BURGER BARS
THAT WILLIAM AND HARRY LOVED.
THIS WAS ALL PART OF DIANA'S
EDUCATION.
>> Reporter: THAT EDUCATION EVEN
INCLUDED SECRET VISITS TO THE
HOME LELESS AND HIV SUFFERERS.
>> IF SHE WAS GOING TO GO OUT
THERE'S NO REASON WHY THE BOYS
COULDN'T.
HARRY WAS TAKEN AT THE AGE OF 9
TO GO MEET PEOPLE WHO WERE
SUFFERING FROM THIS CONDITION.
>> Reporter: BUT DIANA'S BOYS
WOULD BECOME PERSONALLY
ACQUAINTED WITH SUFFERING, THEIR
PARENTS' MARRIAGE COLLAPSE,
THEIR MOM THROWN INTO DEEP
DEPRESSION, THEN THE CAR CRASH
IN PARIS.
OUTSIDE KENSINGTON PALACE, A
CARPET OF FLOWERS.
THE ROYAL FAMILY THROWN INTO
CRISIS BY THE PUBLIC MOURNING
FOR DIANA.
AT HER FUNERAL, WILLIAM AND
HARRY WALKED BEHIND HER COFFIN.
FINALLY ADMITTING NOW THEY'VE
BEEN STRUGGLING WITH HER LOSS
FOR DECADES.
>> I REALLY REGRET NOT EVER
TALKING ABOUT IT.
>> YEAH.
>> FOR THE FIRST 28 YEARS OF MY
LIFE.
>> Reporter: TODAY DIANA'S BOYS
ARE LEADING HER CHARITY AND
MORE.
WILLIAM ON THE COVER OF AN LGBT
MAGAZINE RAISING AWARENESS ABOUT
BULLYING, AND SOMETIMES TO
SPOTLIGHT A CAUSE TO GO FURTHER
THAN EVEN SHE DID.
THE FUTURE KING OF ENGLAND SPENT
A NIGHT SLEEPING ON THE STREETS
OF LON DDON FOR A HOMELESS
CHARITY.
HE WAS PICTURED STANDING RIGHT
HERE.
THAT ABILITY TO CONNECT WITH
ANYONE, THAT WAS DIANA.
HARRY INTRODUCED HIV SUFFERERS
ALL THOSE YEARS AGO PROMOTING
THE CAUSE BY TAKING AN HIV TEST.
AND THERE IS ONE CAUSE THROUGH
WHICH THEY REMEMBER THEIR MOTHER
AND THE DEVASTATING WAY THEY
LOST HER.
>> PROBABLY VERY CLOSE TO A
COMPLETE BREAKDOWN ON NUMEROUS
OCCASIONS.
>> Reporter: WITH KATE, THEY'VE
LAUNCHED A MENTAL HEALTH CHARITY
CALLED HEADS TOGETHER.
THIS MONTH IN A FRANK ONLINE
CHAT.
>> HELLO, PRINCE WILLIAM.
>> HELLO, LADY GAGA.
>> Reporter: PRINCE WILLIAM
PRAISING LADY GAGA FOR OPENING
UP ABOUT HER OWN STRUGGLE.
>> I THOUGHT IT WAS INCREDIBLY
MOVING AND VERY BRAVE OF YOU TO
WRITE DOWN SUCH PERSONAL
FEELINGS.
>> Reporter: TWO PRINCES WHO
JUST LIKE DIANA ARE TRANSFORMING
WHAT IT MEANS TO BE ROYAL.
>> THE QUOTE THAT'S BEEN
ATTRIBUTED TO THE QUEEN AS
SAYING, REALLY, WE'VE GOT A LOT
TO THINK DIANA FOR BECAUSE WE
SEE HER LEGACY RADIATING THROUGH
WILLIAM, RADIATING THROUGH
HARRY.
>> I THINK SHE WOULD BE PROUD OF
THE CAMPAIGN, PROUD OF EVERYBODY
INVOLVED.
PROUD OF WILL.
>> Reporter: HARD TO BELIEVE
THAT WE AND HER SONS LOST HER 20
YEARS AGO.
THINK OF ALL THE EVENTS THAT
HAVE HAPPENED SINCE THEN AND THE
GREATEST SADNESS AND ANYONE WHO
HAS LOST A PARENT EARLY WILL
FEEL THIS IS SURELY THAT SHE
DIDN'T GET TO SEE HER SONS START
THEIR OWN FAMILIES.
GUYS.
>> WHAT A CREDIT TO HER THEY ARE
REALLY.
KIR, THANK YOU SO MUCH.
WE SHOULD MENTION "DATELINE" IS