Memory management - Does addwidget assign a parent

Say I have something like this

void someClass::start()
{
    QLabel* sb = new QLabel();
    sb->setText("Hello World");
    ui.verticalLayout->addWidget(sb);
}

Does addWidget make sb a child of someClass so that when I delete someClass sb is also deleted ? If this is true how do I know which methods in general assign parents to an object ?