In the application of Article 25(1)( d), ( e) or ( f) to any proceedings begun between 14th November 1966 and the commencement of this Order, Article 25 shall have effect as if, in paragraph ( b) in the definition of “child of the family” in Article 2(2), for the reference to any other child such as is there mentioned there were substituted a reference to a child of one party such as is mentioned in section 7(1) of the Maintenance and Affiliation Orders Act (Northern Ireland) 1966 [1966 c.35] ; and in the corresponding application to any proceedings begun before 15th November 1966, Article 25 shall have effect as if the said paragraph ( b) were omitted.