A TFC CONFLICT PRODUCES A TCASII TA FOLLOWED BY AN RA THAT IS NOT FOLLOWED. AFTER CLR OF CONFLICT; THERE IS CONFLICT BTWN THE CREW MEMBERS.

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ACFT WAS ON WESTMINSTER 3 ARR INTO BWI. CAPT WAS PF; FO WAS PNF. ACFT WAS GIVEN CLRNC TO DSND TO 11000 FT FROM PRESENT ALT. DURING DSCNT; TCASII ISSUED A 'TA' AND AURAL 'TFC; TFC' WAS GIVEN. THE ACFT CONTINUED TO DSND WITH THE AUTOPLT ENGAGED. SHORTLY THEREAFTER; TCASII ISSUED 'RA' AND AURAL 'MONITOR VERT SPD.' THE ACFT CONTINUED TO DSND EXCEEDING THE RED AREA IN THE VSI INDICATOR DISPLAYED BY THE TCASII. AT THAT POINT; I (THE FO ACTING AS PNF) SAID WITH CONCERN; 'STOP YOUR DSCNT.' THE ACFT CONTINUED TO DSND WITH AUTOPLT ENGAGED. NEXT EVENTS HAPPENED VERY QUICKLY. NOW AN RA WAS GIVEN BY TCASII 'CLB; CLB; CLB.' NOW I VOICED MY CONCERN VERY LOUDLY AND SAID 'STOP DSNDING; STOP DSNDING; AUTOPLT!' AT THAT POINT; THE ACFT WAS STILL IN A DSCNT AND IN MY JUDGEMENT I MUST NOW ASSUME CTL OF THE ACFT AND BECOME THE PF. AS I REACHED OVER TO DISCONNECT THE AUTOPLT AND TAKE CTL OF THE ACFT; THE TCASII ISSUED THE 'CLR OF CONFLICT' AURAL MESSAGE. WE CONTINUED TO BWI WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE TFC WAS NEVER SIGHTED VISUALLY BUT THE CAPT THOUGHT HE HAD IT WHEN HE SAW TFC ABOVE. THE TCASII TFC WAS BELOW. THERE WAS NO TA FROM ATC. THIS WAS THE LAST LEG OF A MULTI DAY FLT ON WHICH THE CAPT HAD A DISREGARD OF SOP AND CHKLIST POLICIES AND A GENERAL LACK OF KNOWLEDGE OF PROCS. THE RELATIONSHIP BTWN THE CREW MEMBERS DETERIORATED OVER THE COURSE OF THE TRIP UNTIL; IN THE DEBRIEFING OF THIS INCIDENT; IT BECAME ADVERSARIAL. THE COMPANY AND UNION PROFESSIONAL STANDARDS COMMITTEE ARE NOW INVOLVED IN THE PROCESS OF ASCERTAINING THE CAPT'S PROFICIENCY AND FITNESS TO CONTINUE FLYING AS HE APCHS RETIREMENT WITHIN THE NEXT 6 MONTHS.