How to update the state of a sibling component from another sibling or imported component in REACT

JavaScript
1

Hi i just recently started learning ReactJS and been playing around the import and export functions, For example this is the structure of the app, 3 separate files the parent and 2 children; How do i export the state from InputArea to DisplayArea?

Parent Component

import React, { Component } from 'react';
import DisplayArea from './DisplayArea';
import InputArea from './InputArea';

class App extends Component {
  render() {
    return (
      <div id="wrapper" className="App">
        <DisplayArea />
        <InputArea />
      </div>
    );
  }
}

export default App;

Child 1 Component

import React, { Component } from 'react';
import InputArea from './InputArea';

class DisplayArea extends Component {
  constructor(props){
    super(props);
  }
  
    render() {
      return (
        <div className="column">
            <div className="col-body">
                <div id="preview">{ How to display contents here? }</div>
            </div>
        </div>
      );
    }
  }

export default DisplayArea;

Child 2 Component

import React, { Component } from 'react';

class InputArea extends Component {
    constructor(props){
      super(props);
      this.state = {
        content: ''
      }
      this.handleChange = this.handleChange.bind(this);
    }

    handleChange(e){
      e.preventDefault();
      this.setState({
        content: e.target.value
      })
    }

    render() {
      return (
        <div className="column">
          
            <div className="col-body">
                <textarea id="editor" placeholder="Enter text here" onChange={this.handleChange}></textarea>
            </div>
        </div>
      );
    }
  }

export default InputArea;
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