Gradle multiproject doesn't add projects to classpath - gradle

Question

I have some projects that depend on others. I also have a project that depends on two projects that each one depends on the same project. Something like this:
-Project A
* Project 1
** Project C
* Project 2
** Project C
And the structure of the workspace is like this:
-ProjectA
-ProjectC
-Project1
-Project2
All the projects are at the same level.
So in the settings.gradle in my Project A I have:
include ':Project1',':Project1:ProjectC',[...]
project(':Project1') = new File('../Project1')
project(':Project2') = new File('../Project2')
project(':Project1:ProjectC') = new File('../ProjectC')
project(':Project2:ProjectC') = new File('../ProjectC')
And in the build.gradle I do:
dependencies{ compile project('Project1'),project('Project2')
The problem is that it is not correctly added to the classpath. I think since both Project1 and Project2 depends on ProjectC it is overwritten somehow. Any ideas?
Thanks.
EDIT
Here is the tree of dependencies:
Root project 'ProjectA'
+--- Project ':ProjectB'
| \--- Project ':ProjectB:Project1'
| +--- Project ':ProjectB:Project1:Project2'
| \--- Project ':ProjectB:Project1:Project3'
\--- Project ':ProjectC'
\--- Project ':ProjectC:Project1'
+--- Project ':ProjectC:Project1:Project2'
\--- Project ':ProjectC:Project1:Project3'

Answer 1

For a workspace that looks like this:
rootFolder
|
|- build.gradle
|- settings.gradle
|
|- ProjectA
| |-build.gradle
|
|- Project1
| |-build.gradle
|
|- Project2
| |-build.gradle
|
|- ProjectC
|-build.gradle
Your settings.gradle should look like this (irrespective of dependency relationships of the sub projects):
include ':ProjectA',':Project1',':Project2',':ProjectC',
You're just telling the root project that there are 4 subprojects and where they are located. That's it.
Now the dependency relationships are handled inside each subproject's build.gradle files. For a dependency relationship that looks like this:
ProjectA
|-Project1
| |-ProjectC
|
|-Project2
|-ProjectC
ProjectA's build.gradle:
dependencies{
compile project(':Project1')
compile project(':Project2')
}
Project1's build.gradle:
dependencies{
compile project(':ProjectC')
}
Project2's build.gradle:
dependencies{
compile project(':ProjectC')
}

Answer 2

What I finally did is change in the classpath the paths that where wrong like this:
build.gradle
eclipse{
classpath{
file{
whenMerged { classpath ->
classpath.entries.find { entry ->
entry.kind == 'src' && entry.path.contains('ProjectC')
}.each{ entry ->
entry.path=file("/ProjectC")
}
}
}
}
}
And it works fine. I still don't know why gradle doesn't make the classpath correctly...