LGT ON DSCNT AND APCHING MINIMUM FUEL FLIES THROUGH ASSIGNED ALT.

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COPLT LEG. DURING DSCNT FROM FL370 TO FL290 WE WERE GIVEN PUBLISHED HOLD AT RYANN INTXN. I BEGAN TO CALCULATE FUEL REQUIREMENTS BECAUSE WE WERE APCHING MINIMUM FUEL. COPLT BECAME INVOLVED IN DISCUSSION AND FLEW THROUGH FL290. STOPPED DSCNT AT FL283. NO CALL FROM ZFW; NO CONFLICT INVOLVED. CLASSIC CASE OF NO ONE FLYING THE AIRPLANE. HUMAN FACTORS: I FEEL A CONTRIBUTING FACTOR WAS THAT THE FO WAS RESENTFUL OF ME BECAUSE I AM YOUNGER; CIVILIAN TRAINED PLT. FO WAS AIR FORCE ACADEMY GRADUATE; BMB COMMANDER AND APPROX 3 YRS OLDER. DURING THE TRIP; HE WOULD EXHIBIT DESIRES TO CTL THE CREW (HE WAS MORE QUALIFIED); SO WHEN WE WERE APCHING A POSSIBLE FUEL QUANTITY PROB; HE TRIED TO TAKE OVER THE SIT; AND FORGOT TO FLY THE AIRPLANE. AFTER THE ALT BUST; I TOLD HIM' YOU FLY THE AIRPLANE; I'LL TAKE CARE OF THE FUEL.' FROM NOW ON; I AM GOING TO BRIEF; WHOEVER IS FLYING THE AIRPLANE - - FLIES THE AIRPLANE! SUPPLEMENTAL INFORMATION FROM ACN 245227: A CONTRIBUTING FACTOR TO THE DEV IS THE EXCESSIVE IMPORTANCE PUT ON FLYING THE ALT ON THE CAPT'S ALTIMETER. OFTEN CAPT'S AND FO'S ALTIMETERS MAY DIFFER BY 250 FT. THE ALT RPTED BY THE XPONDER MORE CLOSELY CORRESPONDS TO THE CAPT'S ALTIMETER. FLYING CAPT'S ALTIMETER FROM THE R SEAT MAKES FOR A SCATTERED XCHK.