Was it Needles maybe? That was rumored.

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Archived from the IMDb Discussion Forums — Back to the Future Part II

Hollywood_Square_Contestant — 9 years ago(November 30, 2016 07:13 PM)

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ZakkWyldeMyLittlePony — 9 years ago(December 03, 2016 01:22 PM)

Needles is actually a good candidate. IDK who else it could be.
Metallica and Iron Maiden fan who is also a Brony.

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old-skool101 — 9 years ago(December 08, 2016 03:10 AM)

Verne Brown

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mcp-69798 — 9 years ago(December 08, 2016 03:16 AM)

Not Needles, since his full name is Douglas J. Needles, not Tannen. In any case, Biff's son is not relevant to the story so we'll never know.
"You're not thinking 4th dimensionally!"

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McGannahanSkjellyfetti — 9 years ago(December 20, 2016 01:11 AM)

Maybe it was one of the other people in Needles' truck in part 3

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Circle_of_the_Moon2101 — 9 years ago(December 21, 2016 09:46 AM)

I read/heard somewhere long ago that in the earlier drafts of the script that Biff's adult son in 2015 was originally intended to appear, but was cut from the final product for reasons left unexplained.

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loadofsmith — 9 years ago(December 29, 2016 11:04 AM)

If they wanted to show the Tannens as a bully family, in Part 3 Mad dog Tannen was introduced in an old west setting. Why didn't Marty have to tangle also with a Tannen from his generation?
I'm not insane I'm just crazy

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🇲🇮🇰🇪🇭🇻🇳🇹 — 9 years ago(January 04, 2017 08:44 AM)

What makes you think Biff had a son?

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Totally_Kyle — 9 years ago(January 22, 2017 10:57 AM)

You're right, he had a daughter. In a deleted scene Biff talks George into buying peanut brittle from her Girl Scout troupe, explaining why he had a box of it.
Formerly Eclectic_Flamingo

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muchmeow — 9 years ago(February 07, 2017 09:12 PM)

Um no. That was not Biff with the girl scout. That was some random guy who knew George. He was probably a coworker or a neighbor, definitely not Biff.

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samhmd-7489 — 9 years ago(January 25, 2017 07:02 PM)

Isn't his Grandson referred to as Griff Tannen? He'd be from the male child to have the last name.

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🇲🇮🇰🇪🇭🇻🇳🇹 — 9 years ago(January 26, 2017 08:14 PM)

It's not unthinkable to marry someone with the same surname. Or she divorced, kept the tannen name or had the kid out of wedlock and doesn't know who the father is. There are a number of scenarios

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Was it Needles maybe? That was rumored.