How to correctly set the target in turbo prolog?

Question

Prolog

Hello, I can’t find anywhere how to set a target for searching for a brother in the knowledge base of family relations using Turbo Prolog.

spoiler

domains
  a=symbol
predicates
  parent(a,a)
  sex(a,a)
  mother(a,a)
  father(a,a)
  brother(a,a)
  son(a,a)  
  nephew(a,a)
  grandma(a,a)
  grandfa(a,a)
  grandson(a,a)
clauses
  sex(vyacheslav1,man).
  sex(vladimir,man).
  sex(gennady,man).
  sex(vadim,man).
  sex(kirill,man).
  sex(vyacheslav2,man).
  sex(natalia,woman).
  sex(lyubov,woman).
  sex(oksana,woman).
  sex(polina,woman).
  parent(gennady,vyacheslav1).
  parent(gennady,lyubov).
  parent(oksana,vladimir).
  parent(oksana,natalia).
  parent(vadim,gennady).
  parent(vadim,oksana).
  parent(kirill,gennady).
  parent(kirill,oksana).
  parent(vyacheslav2,vadim).
  parent(vyacheslav2,polina).
  
  mother(X,Y):-parent(X,Y),sex(Y,woman).
  father(X,Y):-parent(X,Y),sex(Y,man).
  brother(X,Y):-parent(Z,X),parent(Z,Y),sex(Z,man).
  son(X,Y):-parent(Y,X),sex(X,man).
  nephew(X,Y):-son(X,Z),brother(Z,Y).
  grandma(X,Y):-parent(X,Z),parent(Z,Y),sex(X,woman).
  grandfa(X,Y):-parent(X,Z),parent(Z,Y),sex(X,man).
  grandson(X,Y):-parent(X,Z),parent(Z,Y),sex(Y,man).

As a result, everyone on the Internet is exactly the same, but if I enter the target brother(X, kirill) it does not display anything.
Please help what is the problem?