Laravel 5.1 deleting sub-relationship data when row is deleted

I have an application in Laravel 5.1 where the following tables are setup;

• timesheet
• row
• day_total
• segment_totals

Rows belong to timesheets. Day totals belong to timesheets. Segment totals belong to rows.

When a timesheet is deleted, I also want it to delete the rows from row, day_total and segment_total as well as the row from timesheet table itself.

I hav setup the following boot method in my timesheet model;

/**
 * Boot the model.
 *
 */
public static function boot()
{
    parent::boot();

    static::deleting(function($timesheet)
    {
        $timesheet->row()->delete();
        $timesheet->dayTotal()->delete();
    });
}

I have setup the following in the row model;

/**
 * Boot the model.
 *
 */
public static function boot()
{
    parent::boot();

    static::deleting(function($row)
    {
        $row->day()->delete();
        $row->segmentTotal()->delete();
    });
}

When the timesheet is deleted, the row and dayTotal rows are deleted, but the day and segmentTotals do not get deleted. How can I make Laravel fire the delete on the row model?

via Chebli Mohamed