"Together till the bitter end http://www.nexusmods.com/fallout3/mods/19941/

"From the creator of The Institute, Ties that Bind is a companion mod beyond any other. In addition to adding its own content, it significantly enhances and expands upon the original game experience by introducing Amanda: your sister. The mod was inspired by Liam Neeson's emotionally evocative portrayal of the player's father, and aims to build on this experience through a character who voices many of the natural responses the player has to the game's events. The tie between the player and Amanda will eventually grow even stronger than that with the father, as she is always with him/her through thick and thin, until the bitter end where her survival will rest in the player's hands."

Thanks to this mod. I experienced Fallout 3 again - for the first time

Photoshop CC
3 hours"