Parent.component.ts

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export class ParentComponent{
  inputText!: string;

  brotherMessage$: Observable<string>;
  sisterMessage$: Observable<string>;

  constructor(private uiService: UiService) {
    this.brotherMessage$ = this.uiService.brotherMessage$;
    this.sisterMessage$ = this.uiService.sisterMessage$;
  }
}