public void removeAllChildren() {
		if (_children != null) {
			for (TreeNode<T> child : _children) {
				child.parent(null);
			}

			_children = null;
		}
	}
Removes all children fo {@code this} node and setting their parents to
{@code null}. If {@code this} node has no children, this method does
nothing.
jenetics.ext/src/main/java/io/jenetics/ext/util/TreeNode.java