Del. Code tit. 25 § 310
A married man may relinquish or release to his wife his right of curtesy in any real estate whereof his wife is seized of an estate of inheritance, and a married woman may relinquish or release to her husband her right of dower in any real estate whereof her husband is seized of an estate of inheritance, by deed duly executed and acknowledged, in the manner provided by law for deeds to be recorded, or by deed conveying such estate of inheritance in the real estate by the husband to the wife, or by the wife to the husband, wherein the husband's right of curtesy or the wife's right of dower is specifically relinquished or released and thereafter the real estate may be conveyed, encumbered, devised, or otherwise disposed of, and shall descend free and clear of any such right or estate of curtesy or dower, but the real estate may descend to the husband or wife, as the case may be, in case of the death of the wife or husband intestate, in accordance with law, notwithstanding such relinquishment or release.
25 Del. C. § 310