〜の = ‘s
Jo の neko = Jo’s cat
これは Joのneko です = This is Jo’s cat
Specifying nouns: [noun 1] の [noun 2] = specifying noun 2 using noun 1
eg. Nihon の neko (specifying neko) = Japan’s Cat (Cat of Japan) = japanese cat
Karate の sensei (specifying sensei) = Karate’s teacher (teacher of Karate) = Karate teacher