Inherited theme in sub-directories sites

Is possible to create a child theme which extends from a theme at root level. For example:

-themes:
--MyTheme
-sites:
--site1:
---themes
----MyTheme-Child
--site2:
---themes
----MyTheme-Child
--site3:
---themes
----MyTheme-Child

I want create a only one theme and multiple childs in different sub-directories.

Thanks