§ 503. Duty to support a person unable to financially support oneself. (a) Except as expressly provided in § § 501 and 502 of this title, the duty to support a person unable to financially support oneself rests upon the spouse, parents, or children, in that order, subject to § 504 of this title as to expenses described therein. If the relation prior in order shall not be able, the next in order shall be liable, and several relations of the same order shall, if able, contribute according to their means. (b) For purposes of this section, “a person unable to financially support oneself” includes an adult child with a disability that is unable to support oneself. Code 1852, §§ 850-853, 1468, 1472; 26 Del. Laws, c. 137; 27 Del. Laws, c. 262, § 13; Code 1915, §§ 1463, 3033, 3061; 37 Del. Laws, c. 189, § 8; Code 1935, §§ 1634, 3526, 3548; 13 Del. C. 1953, § 501; 50 Del. Laws, c. 207, § 1; 59 Del. Laws, c. 567, § 1; 70 Del. Laws, c. 186, § 1; 84 Del. Laws, c. 42, § 1; 85 Del. Laws, c. 545, § 1;