"qualified parent" means, subject to regulations under section 177 - (a) a widow, (b) a widower, (c) a separated spouse, (d) an unmarried person, (e) a person whose spouse or civil partner has been committed in custody to a prison or place of detention for not less than 6 months, who is the parent, step-parent, adoptive parent or legal guardian of at least one relevant child, who normally resides with that person (f) a surviving civil partner, (g) a civil partner who is not living with the other civil partner of the civil partnership, or (h) a person who is not a party to a civil partnership;
"relevant age" means - (a) 16 years where - (i) the person in respect of whom the claim for one-parent family payment is being made is qualified for (I) a blind pension under Chapter 5 of Part 3, or (II) a carer's allowance under Chapter 8 of Part 3, including a payment under section 186A, or (ii) a payment under Chapter 8A of Par
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