@ManyToMany(fetch = FetchType.LAZY)
	@JoinTable(
			name = "children",
			joinColumns = @JoinColumn(name = "parent_id"),
			inverseJoinColumns = @JoinColumn(name = "child1_id", insertable = false, updatable = false)
	)
	@WhereJoinTable(clause = "child1_id is not null")
	private List<Child1Entity> children1 = new ArrayList<Child1Entity>();

	@ManyToMany(fetch = FetchType.LAZY)
	@JoinTable(
			name = "children",
			joinColumns = @JoinColumn(name = "parent_id"),
			inverseJoinColumns = @JoinColumn(name = "child2_id", insertable = false, updatable = false)
	)
	@WhereJoinTable(clause = "child2_id is not null")
	private List<Child2Entity> children2 = new ArrayList<Child2Entity>();