Found: Side-Story: Growlentine's Day Special
As zach was tapping the screen, trying to find some kind of mass delete function that didn't exist, that's when he started getting notifications from his brothers, his sisters-in-laws, vanna's parents...
Nisse, Julefest, and Hooves- Ninth Day of Christmas
“while i've never done anything like this before, my sister-in-laws were quite clear." she starts. “i'm sorry, what are we doing?" i ask impulsive and incredulously. she gives me a smug glance.
Hall Monitors Ch. 3
The ewe giggled as she held her little sister-in-law close, the little pup holding a light brown wallet that belonged to trent. how she had managed to get it was still a mystery.
MLP: The Four Infinity. Chapter 1: INCOMING!!! A new kind of creature lands in Equestria.
She looked towards her old babysi--- i mean 'foalsitter', i should say, "and now she is my sister-in-law." "wait what!? she, the princess of... love, your old... foalsitter, is now your sister-in-law!?" she smiled and nodded her head.
A Lamb Among Wolves Ch:7
Unfortunately for the ewe, the first of the hunter sister in-laws she get's to meet just so happens to be a massive tigress with a sharp and cold demeanor. will the ewe manage to keep her composure while staring down this massive predator?
ROI: The Pale Snow - Chapter 4
"an offer from my sister-in-law. good fellow. perfect ideal bodyguard with few words." she turned, composed, but unhidden the smile of impish declaration. "opinions?" "well, he's rather..."
Found (Ch. 16)
._ zach was sitting on the couch, his tail wagging as he looked at the pictures his sister-in-law was quick to send to the family.
Iconoclast Chapter 3
In a split second i think artemis means herself, and looking in her eyes i almost imagine it, but she continues- "my sister in law needs a man to protect her and her children.
Death To Nightmare Chapter 6
Your brother and sister-in-law have them and they are no less important than you. look i'll drop the issue for now but promise me you will at least talk with the sisters and your brother and cadance?" twilight nodded.
SWAT Kats- Take A Chance On Me Ch. 11
She didn't seem to notice it much, chance sat right next to her patting her back softly and rubbing along her spine to comfort his sister-in-law.
Care Bear Magi Life Chapter 42
She jabbed her thumb towards her chest symbol, "i'll go see what's holding up my future sister-in-law, don't go taking off and leaving your kids and family to worry again."
Found (Ch. 21)
"and he was more than happy to explain some things about human health, once we explained about our concerns with lily," dawn explained to her brother and sister in law.