Hmmmmmmmmmmm
I don’t know too sorry
“whose father worked for the railroad” is a subordinate clause as it is a relative clause beginning with the pronoun “whose”. It is particularly used in written English and it refers to possession of things or to make association or connections with other things or people.
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Predicate pronoun
A predicate pronoun is any pronoun that is part of the predicate.
A predicate is the part of a sentence that includes the verb and the words following it that relate to that verb.
Examples:
I will call him .
The teacher gave us a history assignment.
Mother made lunch for them .
A sentence may have more than one predicate; for example:
Mother made lunch for them and set it on the picnic table.
A subjective pronoun can be part of a predicate when it is the subject of a clause,; for example:
Mary brought a cake she made for the party .
A subjective pronoun is also used as a subject complement when it follows a linking verb; for example:
The leaders right now are he and I .
Most likely it will be found under textbook :)