Look at the title. It is one shots and first up is... Malec! (Or Magnus and Alec)
Disclaimer: I own nothing but the kids.
The 12-year-old's dirty blonde hair was coated in dirt, mud, and glitter as she ran to her father. He picked her up and sighed. Her bright green eyes darted to her other father, the one with much more glitter. "Magnus, what did you do to our child?" the man holding the girl asked the other.
"Alexander, I just gave her glitter. She loves it. And this is why she is my daughter! She gets the punctuality from you." Magnus said with a grin as the girl rammed into his legs.
"Daddy! Dad won't let me go play again! Help me!" The girl pleaded.
"Isabelle. He told you, Aunt Clary is going to get married to Uncle Jace today. You have to be clean," Alexander told Isabelle.
"But I wann-"
"Isabelle Clarissa Lightwood. Your other father told you to take a bath. You are a big girl now, and a Shadowhunter. So, now. Go take that bath," Magnus told her, "Now, Alec. Where did you put my suit?"