def _find_children(individual, index):
    """
    Find the children of a node at the given index.
    :param individual: The individual to find the nodes in.
    :param index: The index of the node to find the children of.
    :return: A list of indices of the children.
    """
    node = individual[index]
    children = []
    i = index + 1
    for _ in range(node.arity):
        children.append(i)
        subtree = individual.searchSubtree(i)
        i = subtree.stop
    return children