const user = {
  name: 'Tyler',
  age: 32,
  greet() {
    alert(`Hello, my name is ${this.name}`)
  },
  mother: {
    name: 'Jan',
    greet() {
      alert(`Hello, my name is ${this.mother.name}`)
    }
  }
}

user.mother.greet()

When we invoke user.mother.greet, we can tell what the this keyword is referencing by looking to the “left of the dot” of the invocation – in this case, mother.

So inside of greet, it’s as if we had my name is ${mother.mother.name}, which is clearly wrong. Instead, since the this keyword is referencing mother, we can just do this.name.

const user = {
  name: 'Tyler',
  age: 32,
  greet() {
    alert(`Hello, my name is ${this.name}`)
  },
  mother: {
    name: 'Jan',
    greet() {
      alert(`Hello, my name is ${this.name}`)
    }
  }
}

user.mother.greet()