William is not an only child in these fics, but an older brother.
| Do you have a big brother William/Jackson fic not on this list? Submit it to the archive via our new Tumblr! |
Admit One series by Cathey Scully 
After The Truth series by Pattie 
Alethea by Kyouryoku Senshi
All I Want For Christmas by Pattie
And Baby Makes Four by gillian dana
And Baby Makes Four Returns For Halloween! by gillian dana
Ashputtle by Devin
Babysitting by Tabby
Barbara, Jack and Kyle by Pattie
Bedtime Stories by TrthIsOutThere
Before Trick or Treat by 6friends6
Beyond The Truth: IV. Reopened by Neoxphile
Beyond The Truth: 4.25 The Witching Hour by Neoxphile
Beyond The Truth: 4.5 Thanksgiving Confessions by Neoxphile
Birthday Week by Neoxphile
The Burpday series by Kelly J. Thompson
Can't Sleep by Pattie
Christmas in (Haven) Maine by Neoxphile and Faerax
Christmas For You by Kyouryoku Senshi
A Christmas Wish by Erin Blair
Coming Home by YappiChick
Crystalic Millennia by Kyouryoku Senshi
A Day in The Life - the complete series by Girlie_girl7
December 23rd by AnniePants
Destination: Truth by Kyouryoku Senshi and Billie Reid
Doom Child: Nature vs Nurture by Neoxphile adopted sibling
Doom Child: When She Was Bad by Neoxphile and Raesharra adopted sibling
Draw Down the Moon by Jenna Tooms half sibling
18 years and 1 day by Starbuckmsr
End of the Road by KS
the Everything series by Eral C.
The Family G-Man by Neoxphile and FelineFemme
The Family G-Man: One Fine Summer by FelineFemme and Neoxphile
The Family G-Man: Confessions and Connections by Neoxphile and FelineFemme
The Family G-Man: IWTB by Neoxphile and Felinefemme
The Family G-Man: From Here to Paternity by Neoxphile and Felinefemme
Family Files: V. Caitlin by Wildafox
Fate's Will by ElleThom
Father's Day by Ursula m/m slash
Father's Day II by Ursula m/m slash
Flight into Egypt by Vickie Moseley
Folie by Ursula m/m slash
For the Good of the Child by Aislinn Carter
Forbidden Love by Andrea and Frank
The Game by JL
Gone by Carlysxfiles
Goodwill Towards Men by Neoxphile adopted siblings
Happy Birthday, Baby Boy by Squishy
Happy Birthday Mulder Triplets! by gillian dana
Happy 40th Scully! by Erin Blair
Hermaphrodite by Jo B
Home For the Holidays by Neoxphile
How I Met Your Mother by Topaz Twilights
I Love My Mighty Machine by Pattie
If Daddy Had Only Seen by Kelly J. Thompson
If I Could Fly by Myriss
Iunctio ut Redimio - Book 2 by Kay
The Island of X by Tammy D. Aiken-Phillips
Lessons Learned by TrthIsOutThere
A Life by Jacquie LaVa
The Life They Now Lead by Lilxgirl(aka Abligail)
Meg, I Believe by Pattie
Miracle by Jennis524
Miracle Season by Neoxphile
Mist Over Water by Rae
Mulder House Rules by Sagan
Mulder and William by Christine Leigh
Multiplicity by ElleThom
My Favorite Day by Mish
Mysterious Ways by Neoxphile
The New Arrival by The Fox Never Alone by Xfwriter and GoldenWolf88
One For the Road by Starbuck_Jayne
The Only Broken Universe: Only Because He Needed Us, Broken Mosaic and The Dare by Neoxphile half siblings
Our Miracle Boy is Ten by Pattie
Our Parents by Angela W.
Out of Darkness by KS
Peace of Mind by Spooky2u2
Perfect Happiness by Lilxgirl 
(aka Abligail)
Picking Up The Pieces by Gillyfan
Post-Modern Miracles by Mickey
Recovering Gemini by Neoxphile (being 4 days older counts, right?)
Resistance by Vickie Moseley
Resistance 2 by Vickie Moseley
the Resurrection series by Neoxphile
Sfumato by Supernova
A Sleepy Little Town series: Memory House by Neoxphile
A Sleepy Little Town series: Free Fall by Neoxphile
Sneakers by Gillian Leigh
Soar by EverLeabae
Snow Globes and Seaships by Pattie
Song of Experience by Christy
A Special Gift by ML
Surprise Packages by Jacquie LaVa
Surviving A Different Kind Of Birth by XSketch
Sweet Dreams Series by Alice J. Foster
Team Building by JL
Team Building: Rollover Minutes by JL
Tell 'em William Called by Pattie
Terra Firma IV: Vita Nova by Malibu Sunset
Terra Firma V: Semper Fidelis by Malibu Sunset
Terra Firma VI: Persona non Grata by Malibu Sunset
Terra Firma VII: Riptide
To Save the World by LadyRaider
The Truth Is Not Enough Part 3: William by dana-maru1
Two of a Kind by Girlie_girl7
Unexpected by Twilight Walters
Visitor in the Desert by Gillian Leigh
Water Water Everywhere by afg
We Gotta Get Outta This Place by Pattie
We Who Remain Carry On by Neoxphile half sibling
Welcome to the Family by lil gillian
Why is My Middle Name Ellen? by Pattie
William Long-Ears by Myriss
William was a Bullfrog by AgentMulderFox
William's Fifth Birthday by Erin Blair
Winterlong series by Neoxphile adopted siblings
Without You by Jennis524
Wonder Years by Billie Reid and Kyouryoku Senshi
Xavier by Becka F. adopted sibling
Zephyrs by Becka F. adopted sibling
There are Nursery Files challenges on this topic too, so if you'd like to write a fic about William getting a baby brother or sister check out these challenges