There are five people in their parents ,their sister and ---这里用them/they

问题描述:

There are five people in their parents ,their sister and ---这里用them/they
这里用them还是they,为什么?

dear,这句话漏了内容吧,我猜想应该是这样滴:
There are five people in their family,their parents,their sister and them.
they么是做主语滴,them么宾格做宾语滴.