(a)Any man who has carnal knowledge of a woman with or without her consent who is to his knowledge his grand-daughter, daughter, sister, half-sister or mother (whether such relationship is or is not traced through lawful wedlock); or

(b)any woman of or above the age of 16 who with consent permits her grandfather, father, brother, half-brother or son (whether such relationship is or is not traced through lawful wedlock) to have carnal knowledge of her (knowing him to be her grandfather, father, brother, half-brother or son, as the case may be),