Cao Huan died in 302.
Ly Cao Tong died in 1210.
Cao Van Vien died on 2008-01-22.
Barbara Yu Ling died in 1997.
Kefan Cao goes by Cao Pang Zi.
Cao Yu was born in 1910.
Yu Cao has written: 'Jia' 'Wen ji' 'Ming lang de tian'
Fucheng Cao has written: 'Da jiao yu yu xian dai ren di pei yang' -- subject(s): Education
Yes, Guan Yu was fully loyal to Liu Bei. There was an instance when Guan Yu served Cao Cao, and Cao Cao saw the value of Guan Yu as a warrior, therefore he tried his absolute best to keep Guan Yu as a general, offering him wealth, housing, women, and whatever else he desired. Guan Yu, however, continued to tell Cao Cao that if Liu Bei was found, he would immediately return to his side. He only served him because Liu Bei was missing and hadn't been seen, and was possibly even dead. However, Liu Bei was found afterwards, and despite all the wealth Cao Cao gave him, and all the offerings that he gave to Guan Yu, and even giving him the famous red hare, upon hearing Liu Bei's location, he immediately left with red hare in order to continue to serve Liu Bei, he did not have nearly the wealth or riches that Cao Cao had. Short answer: Yes, he was completely loyal to Liu Bei, and only Liu Bei.
Xiudi He has written: 'Yu yuan shi cao'
When Guan Yu was serving Cao Cao for a short time, he killed Yan Liang and Wen Chou of Yuan Shao
Cao Huan died in 302.
Cao Zhibai died in 1355.
Cao Mao died in 260.
Cao Ren died in 223.
Cao Xiu died in 228.
Cao Xun died in 244.