In twelve years, Mercy turned eighteen and her father, 41. She was given even more medical knowledge as she grew older.
Eventually, she opted to work with Doc Mitchell in Good Springs for a spell before deciding what she truly wanted to do as an RN. She had also gotten the various augmentations other wasteland doctors had as she earned the caps for them.
After working in Good Springs, she returned home to Camp Mcarron as a nurse and worked with Bitterroot's squad as a medic out in the field.
Settling in was easy work, for she could out shoot anyone with her throwing knives with ease. The others were accepting of her because she grew with them and on the base too. Mercy has always kept everyone laughing at her antics and watching her while she grew up into a fine young woman who often fights like the devil is on her ass.
One day, Mercy was with Captain Bitterroot when they had gotten to the old Sassperella factory, both injured with such minor injuries that she managed to clean them and got them bound up easily. She has felt an attraction between them ever since she took to being the field medic of the squad during various jobs both inside and outside of New Vegas.
And so has he. They kept it friendly ever since they were children together. They grew up, each without both parents. Him, by his mother, Leann Rose Marie. And her, by her father, Manny Vargas. And her medical knowledge continues to grow with her squad's help along with the doctor's aide as well back at Camp MCarron too, along with Doc Mitchell in Good Springs, and she's one hell of a midwife for the women who have been close to giving birth.