In 1944, Kawilarang's father was presumed killed while he was a POW on the Japanese cargo ship Junyo Maru (see his father's Japanese detention card at the Dutch National Archives website).
Pada tahun 1944, ayah Kawilarang diduga tewas ketika ia menjadi seorang tawanan di kapal kargo Jepang Junyo Maru (lihat kartu tahanan ayahnya di situs Arsip Nasional Belanda).