call javascript object properties

call javascript object properties

This is probably a very easy question but let's say I have a php
json_encoded javascript object of this form:
var js_objet = {
"1": {
"Users": {
"id": "14",
"name": "Peter"
},
"Children": [
{
id: 17,
name: "Paul"
},
{
id: 18,
name: "Mathew"
}
]
}
}
What is the synthax to get the name of the child with id 18 (Mathew) for
example from that Object?
Thank you