作为资深加拿大联邦持牌移民法律顾问，需了解联邦移民系统中code代码。

以Family Class为例：

FC1-Spouse

FC2-Fiancé(e) 

FC3-Son/Daughter

FC4-All parents and grandparents

FC5-Orphaned brother/sister/nephew/niece/grandchild

FC6-Child to be adopted

FC7-Other relative

FC9-Child adopted by Canadian citizen or PR

FCB-Guardianship

FCC-Common Law Partner

FCE-Conjugal Partner