Kyūjitai form of 両親: parents

one's parents and brothers and sisters; one's nearest relatives

nigorobuna (Carassius auratus grandoculis), a type of 鮒 (funa, “crucian carp”), an edible freshwater ray-finned fish related to carp and goldfish, endemic to Lake Biwa in Japan

(figuratively) being carefree and unaware of an imminent danger