okay! so, i have it that mercedes was engaged to a joker when he was killed ten years ago. she got custody of his four year old daughter and raised her (since her mother was out of the picture) with the help of his parents and her mother. i saw it that the club kept watch over the two of them, making sure they were okay and had what they needed since her ex was part of the club and had died during business. i would love to have her ex-fiances best friend, or even brother, that has kept the closest eye on her, really helped her out, and was her connection into the club when she got her medical license and they started using her as their go-to doctor under the table.