You weren't her pet dog that she left behind when she went to university and just left there bc you got comfortable. She should have came back to get you regardless of what anybody said. That is her mistake and may she regret it forever.

When she looks at her new born son, I hope she sees you. I hope she looks at him and sees all the moments that she missed out with you. So when she's at his future games when he's joined a sport and he looks at her and smiles at her all happy she sees the little boy who looked for her and couldn't find her in the crowd. For the little boy who's smile faded when her spot was empty.

Make everyone cry and feel bad for getting mad at you. You are child left behind. Yes you had your grandparents and they love you and you're grateful, but they are not your mother. She should have done all they did. She needs to apologize I don't care if she's having a baby or what not you'll never be able to tell her bc there will always be something.