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Families

Prime Family Tree
Others

To clarify:

Alpha Prime - father of Elita, Optimus, and Sentinel, father-in-law of Blackarachnia, Airachnid and Ratchet, grandfather to Arcee, Ironhide, and Bumblebee.
Solus - mother of Optimus and Elita. (deceased)
Override - mother of Sentinel, stepmother to Optimus and Elita, mother-in-law to Blackarachnia and Airachnid.

Optimus - son of Alpha and Solus, brother of Elita, half-brother of Sentinel, brother-in-law to Blackarachnia and Airachnid, stepson to Override, husband to Ratchet, biological father of Ironhide, father of Arcee and adoptive father of Bumblebee.
Elita - daughter of Alpha and Solus, sister of Optimus, half-sister of Sentinel, sister-in-law of Blackarachnia and Airachnid, stepdaughter to Override, biological aunt to Ironhide, adoptive aunt of Bumblebee, aunt by marriage to Arcee.
Sentinel - son of Alpha and Override, half-brother of Optimus and Elita, husband to Blackarachnia, brother-in-law to Airachnid and Ratchet, stepuncle to Ironhide, adoptive step uncle to Bumblebee, uncle by marriage to Arcee.

Ratchet - husband of Optimus, biological father of Arcee, adoptive father of Bumblebee, father of Ironhide, brother-in-law to Elita and Sentinel.
Firestar - biological mother of Arcee and Ironhide.
Blackarachnia - wife to Sentinel, sister of Airachnid, sister-in-law of Optimus and Elita.
Airachnid - sister of Blackarachnia, sister-in-law of Optimus, Sentinel, and Elita, girlfriend of Blitzwing.

Ironhide - biological son of Optimus and Firestar, son of Ratchet, brother of Arcee, adoptive brother of Bumblebee, boyfriend of Chromia.
Arcee - biological daughter of Ratchet and Firestar, daughter of Optimus, sister of Ironhide, adoptive sister of Bumblebee.
Bumblebee - adoptive son of Optimus and Ratchet, adoptive brother of Ironhide and Arcee.

The Willoughbys

Soundwave - husband of Rosanna, father of Rumble and Frenzy. (DOB: 23 June 1974)
Rosanna - wife of Soundwave, mother of Rumble and Frenzy (deceased)

The Divins
Cosmos - husband of Glyph, adoptive father of Rumble and Frenzy.
Glyph - wife of Cosmos, adoptive mother of Rumble and Frenzy.
Rumble - biological son of Soundwave and Rosanna, brother of Frenzy, adoptive son of Glyph and Cosmos.
Frenzy - biological son of Soundwave and Rosanna, brother of Rumble, adoptive son of Glyph and Cosmos.

The Briseno-Leons
Knockout - husband of Beta, father of Knock Out.
Beta - wife of Knockout, mother of Knock Out.
Knock Out - son of Beta and Knockout. (DOB: 31 October 1980)

Other Characters

Megatron Coulter (DOB: 27 February 1959)
Starscream Pendergraph (DOB: 9 July 1986)
Shockwave Theus (DOB: 10 May 1972)
Blurr Wienckowski (DOB: 31 December 1987)
Prowl Lapahe (DOB: 1 November 1980)
Thundercracker Lunneborg (DOB: 8 June 1986)
Skywarp Frazier (DOB: 11 January 1986)
Blitzwing Hirsch (DOB: 13 October 1974)
Jetstorm & Jetfire Krestyanov (DOB: 26 June 1990)

will be added to in the future

Birthplaces

Optimus & Elita - Annapolis, Maryland
Ratchet - Sacramento, CA
Arcee & Ironhide - Jasper, NV
Bumblebee - unknown
Sentinel - Tacoma, WA
Megatron - Phoenix, AZ
Starscream - Las Vegas, NV
Knock Out - New York, NY
Soundwave - Phoenix, AZ
Shockwave - London, England
Blurr - Boston, MA
Prowl -
Thundercracker - New York, NY
Skywarp - New York, NY
Blitzwing - Brunswick, Germany
Jetfire & Jetstorm - Yakutsk, Russia


Relationships (romantic and otherwise)

Optimus & Ratchet - together for 25 years, married for 20 years.
Megatron & Starscream - together for 9 years.
Shockwave & Blurr - together for 5 years.
Soundwave & Rosanna - together for 6 years, married for 5 years.
Soundwave & Knock Out - together for 4 years.
Sentinel & Blackarachnia - together for 8 years, married for 5 years.
Blitzwing & Airachnid - together for 5 years.
Starscream, Thundercracker and Skywarp - fraternity brothers.


Occupations

Optimus - police officer
Ratchet - trauma team leader
Megatron - CEO of Kaon Industries, a weapons manufacturing company
Soundwave - software programmer at Kaon Industries
Starscream - autopsy technician
Knock Out - EMT (emergency medical technician)
Shockwave - lawyer
Sentinel - police officer
Blurr - grocery store cashier
Prowl - police officer
Breakdown - school bus driver
Red Alert - neurologist

more will be added to this post in the future