After The Truth series by Pattie

And Baby Makes Four by gillian dana

And Baby Makes Four Returns For Halloween! by gillian dana

Baby Mine by Debbie Gramlich

Baby, Oh Baby! by Cassie Consten

Babysitter Wanted by Alien Girl

Back to where it started by Tanja

Birthday Week by Neoxphile

Christmas Time is Here Again by hellogoodbye57

Coach II by Gillian Leigh

Counting Blessings by Diadem

The Discovery Series by Erin Blair

Entertaining Angels by JadedX

The Family G-Man by Neoxphile and FelineFemme

Five Years by xfilesjunkie

Four Corners Cycle by Spooky247

the Genesis Project by aRcaDIaNFall$

Goodwill Towards Men by Neoxphile

Happy Birthday Mulder Triplets! by gillian dana

I Shall Believe by Cathey Scully

I Should Have Known by ElleThom

If by Ewa

If Only I by Ewa

It Just Happened by Mystic

The Lullaby series by Donnilee

Miracle Season by Neoxphile

Mulder and the Quads by Agent Leki

Only Broken Universe by Neoxphile

Our Sweetest Songs by Jamie Taylor

Taming The Unicorn by Imajiru

Wassail - an X-Files Christmas story by Julie L. Jekel

When Fate Takes A Hand by Madam F

The Winterlong series by Neoxphile

The X-Files Chronicles by Madam F

Write a big family fic yourself by doing one of these challenges :)

Big Family Challenge

One Each Way Challenge

Merry Multiples Challenge