I thought this would be a funny idea.
Kind of a part two to A Different Arrival
Damian- 1
Tim-10
______________________

For the first couple months Damian was at the manor he hadn't really done much. Just normal baby things like crawling, baby talk, etc. But something, when Damian turned 1 and a half, compelled him to feel jealousy towards Tim, possibly even hatred.

It all started when Damian learned to climb out of his crib. In the middle of the night, Damian roamed around destroying any of Bruce's papers he could find in his study. By morning, his study was a mess and all fingers pointed to Tim.

"Timothy, I know you don't like when I leave for work but you can't destroy all my paperwork!" Bruce yelled after discovering the shreds of paper littering the floor. "It wasn't me!" Tim protested. Bruce crossed his arms. "Then who was it?" Bruce asked. "I don't know! But it wasn't me!" Tim retorted. "Just go to your room. We'll talk about this later." Bruce said, turning and picking up some papers that were mostly readable.

Tim stomped out of the room and made his way to his bedroom. On the way, he passed by Damian who stuck his tongue out at him. One look at Damian's face and Tim knew. He'd been framed. He walked up to the play pin and stuck his face in Damian's. "You may have started the war, but you're not gunna win it." Tim said angrily. Damian responded by hitting him in the head with a block. Tim rubbed his head and walked away.

The next day when Damian was put down for a nap, Tim picked him up carefully, so not to wake him, and dipped his hands in blue paint that they were using to remodel Damian's room with. Tim began placing little prints of Damian's blue hands on the walls, door, and tipped over the can as a final touch. He heard Bruce coming through the front door and quickly put Damian down and left the room.

"Alfred? Where's Damian?" Bruce asked, looking around the missing baby's crib. He decided to check in the boy's room. Upon entering, he was met with a blue handed Damian looking up at him with paint everywhere.

  Bruce walked up to him and picked him up. Tim was watching from the doorway with a smirk on his face. Bruce put on a stern face. "Damian. Look what you've done." He said, turning the boy to see the mess. "Come on, you need a bath." Bruce said, tiredly. 

Tim smirked before hiding behind the door when Bruce left to go give Damian a bath. Damian saw him as they walked away and stuck his tongue out. Tim repeated the gesture back at him, feeling accomplished.

The next day, a very expensive vase with a ball next to it was found broken and Tim was blamed for it again.

"I told you not to throw things in the house, Tim." Bruce said sternly. "It wasn't me! It was Damian!" Tim replied. "How could Damian possibly have gotten the ball in the first place?" Bruce said, crossing his arms. "I don't know how he does it, but he does! Somehow." Tim said. "Don't blame your brother for this." Bruce replied. "He's the one blaming me!" Tim yelled back. "Go help Alfred with lunch. No Robin tonight." Bruce said, beginning to walk away.

Tim just wanted to scream at Bruce but decided against it, knowing it wouldn't help his case. Tim walked into the kitchen with a frown. "Bruce told me to help you make lunch." He said, resting his elbows on the counter. "Well I'm mostly done with everything, but you can feed Damian." Alfred said, handing a can of baby food to Tim.

Tim took it with a fake smile and walked over to Damian in his high chair. Tim scowled at the baby and took a spoonful of baby food and fed it to Damian. 2 seconds later and the food was all over Tim's face where Damian spit it out at him. Tim looked at him with an angry face and dipped the spoon back in, this time throwing the food at the baby's face.

This repeated for awhile until Bruce walked in to see what was happening. He pulled Tim back by his arms. "What is going on here?" Bruce asked sternly. Tim didn't answer and kept glaring at Damian, who was glaring right back at him. A few seconds past until Tim spoke up. "Can we get rid of him?" Bruce just sighed.