So yeah, it was time for me to do this, since the characters are a lot and there's not really the chance to include all the information in the story. So here's something that might help you.

Pete Wentz
Age: 411 years old. Born in 1596, turned in 1624 at the age of 28.
Role: vampire, leader of a hunting clan
Sire: undisclosed
Mate: Patrick Stump
Childer: Mikey Way, Alicia Simmons, Ryan Ross
 
Patrick Stump
Age: 386 years old. Born in 1621, bitten in 1645 at the age of 24.
Role: werewolf, co-leader of a hunting clan
Bitten by: Butch Walker
Mate: Pete Wentz
Pack: formerly Butch Walker’s pack, now co-leader of Pete Wentz' hunting clan
 
Gabe Saporta
Age: 436 years old. Born in 1571, turned in 1597 at the age of 26.
Role: vampire
Sire: Bianca
Mate: William Beckett
Childer: Frank Iero, Gerard Way, William Beckett, Brendon Urie
Clan: Pete Wentz’ clan 
 
William Beckett
Age: 23 years old. Born in 1985, turned in (March) 2008 at the age of 23.
Role: vampire, hunter
Sire: Gabe Saporta
Mate: Gabe Saporta
Childer: none
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 1992 at the age of 7. 
 
Mikey Way
Age: 353 years old. Born in 1664, turned in 1687 at the age of 23. Killed by the Butcher in 2008, at the age of 353. Brought back in 2008.
Role: vampire
Sire: Pete Wentz
Mate: none
Childer: Tom Conrad
Clan: formerly Gerard Way’s clan, now Pete Wentz' clan 

Maja Ivarsson
Age: 28 years old. Born in 1979.
Role: witch
Mentor/teacher:Butch Walker
Clan: Pete Wentz’ clan.
Joined: started to hand out at the Manor in 1997 at the age of 18. Moved in in 2008, at the age of 28. 

Ryan Ross
Age: 21 years old. Born in 1986, turned in (January) 2008 at the age of 21.
Role: vampire, hunter, cook, hacker
Sire: Pete Wentz
Mate: none
Childer: none
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 1997 at the age of 11.

Brendon Urie
Age: 20 years old. Born in 1987, turned in (March) 2008 at the age of 20.
Role: hunter, vampire
Sire: Gabe Saporta
Mate: none
Childer: none
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 2002 at the age of 15. 

Spencer Smith
Age: 20 years old. Born in 1987.
Role: hunter, research expert
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 2003 at the age of 16. 

Jon Walker
Age: 22 years old. Born in 1985.
Role: hunter, former thief
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 2005 at the age of 20.  

Tom Conrad
Age: 23 years old. Born in 1984, turned in 2007 at the age of 23.
Role: vampire, hunter
Sire: Mikey Way
Mate: none
Childer: none
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 1997 at the age of 13. Left in 2005. Joined the clan again in 2008.

Butch Walker
Age: 548 years old. Born in 1460, bitten in 1495 at the age of 35.
Role: werewolf, hunter
Bitten by: Matt Bellamy
Mate: Bianca
Pack: his own

Greta Salpeter
Age: 20 years old. Born in 1988, bitten in 2004 at the age of 16.
Role: witch, werewolf
Mentor/teacher: Butch Walker
Bitten by: Butch Walker
Clan: none, Butch Walker's pack 
 
Joe Trohman
Age: 352 years old. Born in 1656, bitten in 1679 at the age of 23.
Role: werewolf, hunter
Bitten by: undisclosed
Mate: none
Pack: formerly Butch Walker’s pack, now part of Pete Wentz' clan
Joined: arrived at the Manor in 2008, at the age of 352.

Bryce Avary
Age: 24 years old. Born in 1983, bitten in 2008 at the age of 24.
Role: werewolf
Bitten by: undisclosed
Mate: none
Pack: formerly Pete Wentz' clan, now part of Butch Walker's pack
Joined: arrived at the Manor in 2008, at the age of 24.

Bianca
Age: 843 years old. Born in 1165, turned in 1191 at the age of 26.
Role: vampire, former huntress
Sire: Brian Molko
Mate: Butch Walker
Childer: Gabe Saporta
 
Brian Molko
Age: 984 years old. Born in 1024, turned in 1052 at the age of 28.
Role: vampire, member of the Council
Sire: undisclosed
Mate: none
Childer: Ashlee Simpson, Bianca
 
Matt Bellamy
Age: 814 years old. Born in 1194, turned in 1224 at the age of 30.
Role: werewolf, member of the Council
Bitten by: undisclosed
Mate: none
Bit: Butch Walker.

Ashlee Simpson
Age: 692 years old. Born in 1316, turned in 1340 at the age of 24.
Role: vampire, member of the Council
Sire: Brian Molko
Mate: none
Childer: Pete Wentz
 
Billie Joe Armstrong
Age: 36 years old. Born in 1972, turned in 2003 at the age of 31.
Role: former vampire, hunter
Sire: (former) Ray Toro
Mate: none
Childer: none
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 2008 at the age of 36. 

Mike Carden
Age: 24 years old. Born in 1984.
Role: hunter
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 1999 at the age of 15. 

Adam T. Siska / Sisky
Age: 20 years old. Born in 1988.
Role: hunter, wizard
Mentor/teacher: Maja Ivarsson
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 2007 at the age of 19.

Alex Suarez
Age: 26 years old. Born in 1981.
Role: hunter
Clan: Pete Wentz’ clan
Joined: arrived at the Manor in 2007 at the age of 26.

Bob Bryar
Age: 245 years old. Born in 1766, turned in 1794 at the age of 28. Killed in 2008.
Role: vampire, formerly leader of a clan
Sire: undisclosed
Mate: none
Childer: undisclosed
Clan: formerly his own clan, now part of Pete Wentz’ clan
Joined: arrived at the Manor in 2008 at the age of 245.

Pierre Bouvier
Age: undisclosed, approximately 250.
Role: ghost
Killed by: Gabe Saporta

David Desrosiers
Age: undisclosed, approximately 200.
Role: ghost
Killed by: Frank Iero

Gerard Way
Age: 356 years old. Born in 1661, turned in 1686 at the age of 25.
Role: vampire, leader of a neutral clan
Sire: Gabe Saporta
Mate: Frank Iero
Childer: Brent Wilson, undisclosed 

Frank Iero
Age: 385 years old. Born in 1622, turned in 1646 at the age of 24.
Role: vampire, co-leader of a neutral clan
Sire: Gabe Saporta
Mate: Gerard Way
Childer: undisclosed
Clan: Gerard Way’s clan 

Andy Mrotek / The Butcher
Age: 205 years old. Born in 1802, turned in 1827 at the age of 25.
Role: vampire, leader of a clan
Sire: undisclosed
Mate: none
Childer: undisclosed

Andy Hurley
Age: 328 years old. Born in 1680, bitten in 1707 at the age of 27. Killed by the Butcher in 2008, at the age of 328.
Role: werewolf, hunter
Bitten by: undisclosed
Mate: none
Pack: Butch Walker’s pack

Brent Wilson
Age: 20 years old. Born in 1987, turned in 2006 at the age of 18.
Role: vampire, former hunter
Sire: Gerard Way
Mate: none
Childer: none
Clan: formerly Pete Wentz’ clan, now Gerard Way’s clan
Joined: arrived at the Manor in 1999 at the age of 12. Left in 2005.

Ray Toro
Age: 223 years old. Born in 1784, turned in 1813 at the age of 29.
Role: vampire, leader of a clan
Sire: undisclosed
Mate: none
Childer: Billie Joe Armstrong

Other hunters of the Wentz clan who live at the Manor: Victoria Asher, Travis McCoy, Michael Guy Chislett. 
Other hunters who moved in at the Manor after Ryan got kidnapped: Ryland Blackinton, Nate Novarro, Mike Dirnt, Tré Cool, Cassie, Keltie, Haley.

Updated to: Chapter 24 (final chapter) of I slept with someone in the Wentz clan

If I missed something or someone and/or you have questions, just let me know. I hope this is helpful.
JM