When an eligible individual without an eligible spouse has an essential person (as defined in § 416.222 of this part) in his home, the amount by which his rate of payment is increased is determined in accordance with §§ 416.220 through 416.223 and with 416.413 of this part. The essential person's income is deemed to be that of the eligible individual, and the provisions of §§ 416.401 through 416.426 will apply in determining the benefit of such eligible individual.
20 C.F.R. §416.428