There are six crews that comprise the DiMeo/Soprano Family.

In the beginning of Season One, here are the capos of the six crews:
Tony Soprano, capo of the Tony Soprano crew.
Junior Soprano, capo of the Junior Soprano crew.
Jackie Aprile, capo of the Jackie Aprile crew and the acting boss of the Family (the real boss, Ercoli DiMeo, is in prison for life).
Raymond Curto, capo of the Raymond Curto crew.
Larry Barese, capo of the Larry Barese crew.
Jimmy Altieri, capo of the Jimmy Altieri crew.

As Season One ended, Jackie was dead of cancer, Jimmy Altieri got executed, and Junior was elevated to acting boss.

As Season Two began and progressed, here are the capos:
Paulie Gualtieri, capo of the Tony Soprano crew.
Philly Parisi, capo of the Junior Soprano crew (Junior is still the acting boss and Tony is the "street boss").
Richie Aprile, capo of the Jackie Aprile crew.
Raymond Curto, capo of the Raymond Curto crew.
Albert Barese, acting capo of the Larry Barese crew (while his older cousin is in jail awaiting trial).
As of this time, it was unclear who was the capo of the now-dead Jimmy Altieri's crew.

Philly Parisi is killed, and the capo spot is again left to Junior in the Junior Soprano crew.

In Season Three, here are the capos:
Paulie Gualtieri, capo of the Tony Soprano crew.
Junior Soprano, capo of his crew and still acting boss (though "street boss" Tony is the one who really calls the shots).
Gigi Cestone, capo of the Jackie Aprile crew.
Raymond Curto, capo of the Raymond Curto crew.
Albert Barese, acting capo of the Larry Barese crew.
Still no revalation on who is the capo of Altieri's crew.

In Season Three, Gigi dies of a heart attack, and Ralph Cifaretto takes over as capo of the Aprile crew.

As Season Four began, here are the capos:
Paulie Gualtieri, capo of the Tony Soprano crew (Christopher Moltisanti was briefly the acting capo while Paulie was in jail).
Bobby Baccalieri, now the capo of the Junior Soprano crew.
Ralph Cifaretto, capo of the Aprile crew.
Raymond Curto, capo of the Raymond Curto crew.
Albert Barese, acting capo of the Larry Barese crew.
Carlo Gervasi is revealed as the capo of Jimmy Altieri's old crew.

Ralph, as we know, was killed by Tony, and for a time the capo slot in the Aprile crew was left vacant.

In Season Five, these were the capos:
Paulie Gualtieri, capo of the Tony Soprano crew.
Bobby Baccalieri, capo of the Junior Soprano crew.
Vito Spatafore, capo of the Aprile crew.
Raymond Curto, capo of the Raymond Curto crew.
Carlo Gervasi, capo of the Carlo Gervasi (formerly Jimmy Altieri) crew.
And Larry Barese appears to be in control once again as capo of the Larry Barese crew.

Yup, personnel issues abound for Tony Soprano!