Optimus is your father. Optimus had started raising you along side megatron his remarried husband. He has raised sparklings before so he has some experience to raise you and he was your favorite parent.

After you came home from your after school walk with megatron you waved at him and he waved back smiling as megatron gave him a quick peck to the lips and went for walk by himself and you and him were left alone.

"How was your walk" Optimus said with a smile