Code :

<style>
.indent50 {padding-left: 50px}
.ita {font-style: italic}
</style>
[ecf title="Parent" contentclasses="indent50"]
[ecf-1 title="Child 1" contentclasses="indent50"]
[ecf-2 title="Child of child 1" contentclasses="indent50"]
Child of child 1 content
[/ecf-2]
[/ecf-1][ecf-1 title="Child 2" contentclasses="indent50"]
[ecf-2 title="Child 1 of child 2" contentclasses="indent50"]
Child 1 of child 1 content
[/ecf-2][ecf-2 title="Child 2 of child 2" contentclasses="indent50 ita"]
Child 2 of child 2 content
[/ecf-2][ecf-2 title="Child 3 of child 2" contentclasses="indent50"]
Child 3 of child 2 content
[/ecf-2]
[/ecf-1][ecf-1 title="Child 3" titleclasses="ita"]
Child 3 content
[/ecf-1]
[/ecf]

Result :