def group_by_language_family(wiki):
    """
    Group languages by language family.

    Parameters
    ----------
    wiki : list of dicts
        Each dict represents a langauge

    Returns
    -------
    dict
    """
    families = []
    fam2index = {}
    for language in wiki:
        eng = language['English']
        if language['Language family'] not in fam2index:
            fam2index[language['Language family']] = len(fam2index)
            families.append({language['Language family']: [eng]})
        else:
            d = families[fam2index[language['Language family']]]
            key = d.keys()[0]
            d[key].append(eng)
    return {'': families}
