C421 PLT MISTAKENLY LANDS ON THE WRONG PARALLEL RWY DUE TO PAX DISTR DURING APCH; FATIGUE AND COMPLACENCY.

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ZFW HANDED OFF TO TUL APCH. APCH ADVISED A 10 DEG TO THE R HDG CHANGE APPROX 20 MI S OF THE FIELD. TOLD TO EXPECT THE VISUAL RWY 36L. AFTER SOME MINS; APCH ADVISED L TURN TO 350 DEGS. 1-2 MINS LATER; ADVISED ARPT 12 O'CLOCK AND 10 MI. I HAVE RWY IN SIGHT AND APCH HANDED ME OFF TO THE TWR. I SET UP ON A LONG STRAIGHT-IN FOR RWY 36 AND DID NOT REFER AGAIN TO MY COMMERCIAL APCH PLATE. R SEAT PAX ASKED ABOUT LIGHTS BESIDE RWY (VASI). I LANDED; AND ON ROLLOUT REALIZED I HAD LANDED ON RWY 36R. TWR ADVISED TO DEPART RWY; REMAIN ON FREQ AND TAXI TO PARK. NEITHER I NOR THE TWR ACKNOWLEDGED THE TRANSGRESSION. FATIGUE WAS BY FAR THE BIGGEST FACTOR. DISTR WAS A NEAR SECOND. GIVEN THE LONG FULL DAY; I WAS DEFINITELY TIRED. MY R SEAT PAX WAS A FIRST TIME IN SMALL PLANE. HE HAD LOTS OF QUESTIONS AND BECAUSE OF THE BEAUTIFUL CLR NIGHT I DID NOT ADHERE TO MY NORMAL RULE OF NO TALKING ONCE ON WITH APCH. THE VECTOR FROM APCH TOOK ME E OF THE FIELD AND MY SITUATIONAL AWARENESS WANED. WHEN VECTORED BACK TOWARD THE FIELD; I SET UP ON FIRST RWY IN SIGHT. RWY 36L HAS NO INST APCH; RWY 36R DOES. HAD I TUNED THE RWY 36R LOC I WOULD HAVE REALIZED I WAS ON THE WRONG APCH. HAD I KEPT A MORE DILIGENT SCAN OUTSIDE THE AIRPLANE; I WOULD HAVE SEEN US PASS BOTH RWYS.