Donnie ran into the main room with you in his arms.
"guys!" Donnie yelled
Raph, Mikey, Leo and Splinter all looked at Donnie waiting for him to continue
"Y/n is our baby sister!" Donnie stated
Raph, Leo and Mikey all looked at each other and back to Donnie
"yeah we already know caption obvious" Raph sassed
"no I mean she's out sister by blood!" Donnie reworded his sentence
"WHAT!?" The three yelled in a unison
"how my son?" Splinter spoke
"Well she was created, they took a human girl off the street and impregnate her with our DNA and so Y/n is part human and has 25% of each of our DNA though" Donnie stated
"whoa" the three spoke in shocked
"I see" Splinter spoke as he stroke his bread
You looked up at your older brothers and they all stared at you in 'awe' and soon Donnie sat on the couch with you on his lap and then all four of your older brothers were cuddling you as they watched TV and as you were drifting off into sleep.