Rachel Crow's shocking elimination on Thursday night's X Factor isn't going to stop her drive for fame and fortune because she's determined to take care of her sick father, RadarOnline.com has exclusively learned.

Rachel, 13, was adopted by Barbara and Kelly Crow when she was a baby and has made no secret of her family's struggle -- but according to one family member, has kept her father's medical condition a secret.

"Rachel's dad has MS (multiple sclerosis) and he can't drive his truck because of it, so he's not going to be able to always work," a close family member who wishes to remain anonymous told RadarOnline.com in an exclusive interview.