刘家勇是刘家良二姊的儿子，也是刘家良的外甥。刘家勇本姓何，但酷爱功夫，从小就跟了刘家良学刘家的功夫医术，从影后改艺名为“刘家勇”。七十年代中期，刘家勇便跟刘家良进入电影行，七十年代后期做过一些　港台低成本功夫片的主角，身手不错，只是当时香港功夫片兴旺，高手如云，刘家勇没能脱颖而出。80年代初，不知为何消失了近六年，88年，转为幕后的他再重新回来，89年做导演拍了《黑色迷墙》、《初到贵境》两部戏，94年参与制作了成龙的《醉拳2》、李健生的《暴风雨》，94年导了一部《灯笼》。拍摄完《醉拳3》后刘家勇就基本退出了电影。偶有什么新年庆典，刘家班兄弟出来舞狮打鼓，才能见到过他。刘家勇现为香港中外洪拳国术会馆永远会长、中国香港南拳国术顾问。自己也开设有洪拳武馆。

Lau Kar Yung's grandfather Lau Cham(Lau jaam) been famous for his strength. He could hold up the lion's head for hours in lion dances. Lau Cham also taught his sons and daughter Hung Kuen, Lion dancing, and Chinese Herbal Medicine/Clinic. Lau Kar Yung is the grandson of Lau Cham (Lau Jaam). Kar Yung is the son of Lau Cham's second daughter Lau Shiu Yee and is also Lau Kar Leung and Lau Kar Wing’s nephew. His birth last name is Ho, and he loves training kung fu since young. When he was five years old, he was followed Lau Shiu Yee (Mother) to learn Lau’s Family Hung Kuen, lion dancing, and Chinese herbal medicine(dit ta) at Lau cham’s martial arts school. He also joined the Lau Kar Ban(Liu Jiaban)/ Lau’s brothers and changed his name to actor name "Lau Kar Yung ". 62 year later, he is now the Fifth Generation Wong Fei Hung Hung Kuen Lau Kar's Grandmaster. The Love of Hung Ga and making kung fu movie, his goal is to travel around the globe passing on their Lau family Kung Fu and Dit-ta knowledge to one that loves Hung Kuen. Lau Kar kung fu has always been on cinema movie/films proudly made more than 500 movies/films. Currently, he continues spreading the lineage across the globe. The additional family member was added for The 6th generation apprentice, representing Germany Master Jau and Mexico Master James Valentino Santi. Still want involving in making new action films or movies with young blood. Kar Yung's title as Hung Kuen Consultant in the movie industry.