I find this phrase/expression rather funny : 'And Bob's your uncle' it is an expression of unknown origin, that means "and there it is" or "and there you have it." It is commonly used in Great Britain and Commonwealth countries. Typically, someone says it to conclude a set of simple instructions. The meaning is similar to that of the French expression "et voilà!" Sometimes the phrase is followed with "and Nellie's your aunt" or "and Fanny's your aunt." It is sometimes elaborately phrased Robert is your mother's brother or similar for comic effect.