a.blade.php

A BEGIN                                                                         
@yield('content')                                                               
A END

b.blade.php

@extends('a')                                                                   
                                                                                
@section('content')                                                             
B BEGIN                                                                         
@yield('content')                                                               
B END                                                                           
@stop

c.blade.php

@extends('b')

@section('content')
C BEGIN
@yield('content')
C END
@stop

output.html

A BEGIN
C BEGIN
C END
A END