Companies’ relationships data / CH Schema?

Apologies for my ignorance as I’m a newbie to this .
I’m trying to get the companies family trees, parent company and/or Child Company, if applicable.
I Downloaded the (366Mb) , but I can’t see companies relationships there.
Is there something I could filter by or other data set that could link them together, please?
Where could I find the number of employees and revenue of each company ?
Furthermore, does CH have a schema which outlines how data can be linked appropriately?

Many thanks.