Question for NW or UAL Delta and UPS or any other LONG Haul folks?

When you folks operate a ultra Long haul flight (i.e double crew )

Do most of you have 1 CAP and 3 RFO's?

If you have 2 CAPT's and 2 FO's, how is this handled at your specific company?

Do these crews stay together for the return trip or do they separte and operate different trips once at the overseas destination?

Does one crew do the Take-off and the other crew do the landing? and how is the PIC determined?