[identity profile] oasis6028.livejournal.com 2010-08-31 02:35 am (UTC)(link)
One of my all time favorites - Dark Roots by the fabulous Morpheus.

http://www.mags-nificent.com/MSW/MorF/S4.htm

[identity profile] ch33rylips.livejournal.com 2010-08-31 02:36 am (UTC)(link)
http://morpheusqaf.com/DarkRootsIndex.html

Totally must read.

[identity profile] qafkinnetic.livejournal.com 2010-08-31 02:37 am (UTC)(link)
The Wedding Present by Predec2
http://www.fanfiction.net/s/6220271/1/The_Wedding_Present

It's a WIP, they only started a few weeks ago.

[identity profile] sarahdipity221.livejournal.com 2010-08-31 02:38 am (UTC)(link)
Dark Roots by Morpheus fits your request almost perfectly. It's very well written and pretty lengthy. You can find it here: http://morpheusqaf.com/DarkRootsIndex.html

I also really like besame_bj's fic Mirror which is also lengthy and has several sequels. In this one Brian still has the same dad but finds out he has a twin brother who was given up for adoption. Here is the link to the first chapter: http://besame-bj.livejournal.com/26956.html

Hope this helps!

[identity profile] court1429.livejournal.com 2010-08-31 02:40 am (UTC)(link)
There's also one where Carl is Brian's dad, but I don't remember any details.

[identity profile] balrogtweety.livejournal.com 2010-08-31 03:30 am (UTC)(link)
[livejournal.com profile] edom has one called Going After Him. It can be found:

http://www.midnightwhispers.ca/viewstory.php?sid=995

It's a WIP.

[identity profile] barbygirl18.livejournal.com 2010-08-31 08:48 am (UTC)(link)
Hi! I found two fic

Where I Belong
http://www.mags-nificent.com/MSW/TriF/WIB.htm

I think in this one jack isnt brians dad but i'm not sure

Be Careful What You Wish For
http://www.mags-nificent.com/MSW/Collaborations/Careful.htm