ðeɪ bɪkˌeɪm fˈeɪməs fɔːɹ dɪvˈɛləpɪŋ ɐ kˌɑːntɹəvˈɜːʃəl tɹˈiːtmənt jˈuːzɪŋ lɔːɹˈɛnzoʊz ˈɔɪl fɔːɹ ðɛɹ sˈʌnz ɪŋkjˈʊɹɹəbəl ˈɪlnəs.
They became famous for developing a controversial treatment using Lorenzo's oil for their son's incurable illness.