英语of词组Are these the photos of your parents?of后是用名词还是名词性物主代词?

LZ !
Are these photos of your parents?不能加the 一个名词只能有一个限定词!
应该是 your parents' .加所有格.
如果主语是生命 of机构后面就要加所有格.不是生命就不加 如 Are these bulidings of the town?