I realize this is a very old message. Just in case you are still looking, the parents of Obedience Robinson (Robertson) were Gross Scruggs Robinson and Sarah Anderson of Cumberland Co., VA.

The proof of her parents can be found in Cumberland Co., VA chancery court records, the case of Thomas L Meador and others VS the admx of Gross Robinson and others (1842-43).

If you are still looking and would like more information, I'd be happy to help.