public class Parent implements Serializable {
    private boolean confirmed;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "parent", cascade = CascadeType.ALL)
    @OrderBy("date")
    private Set<Child> children;

public class Child implements Serializable {
    @ManyToOne(fetch = FetchType.LAZY)
    private Parent parent;

public class Bean
public void applyAddChild() {
    newChild.setDate(new Date());
    newChild.setParent(selectedParent);
    selectedParent.getChildren().add(newChild);

    try {
        service.update(selectedParent);
        Messages.addFlashMessage("Insert Successful");
    } catch (Exception e) {
        Messages.addFlashErrorMessage(e.getMessage());
    }

    newChild = new Child();
}


public void confirmSelected() {
    selectedParent.setConfirmed(true);
    try {
        service.update(selectedParent);
        Messages.addFlashMessage("Confirmed For Parent");
    } catch (Exception e) {
            Messages.addFlashErrorMessage(e.getMessage());
    }
}

<p:commandButton action="#{bean.confirmSelected()}"
    rendered="#{not parent.confirmed}" value="Confirm?" update="@form">
    <f:setPropertyActionListener value="#{parent}"
    target="#{bean.selectedParent}" />
</p:commandButton>

<p:commandButton oncomplete="PF('addChildDialogWv').show()"
    update="@form" value="Add Child">
    <f:setPropertyActionListener value="#{parent}"
    target="#{bean.selectedParent}" />
</p:commandButton>