Maven skip site/reporting for module

You can also ignore report generation with:

mvn -Dmaven.site.skip=true clean install for example

You can also ignore report generation on the command line:

mvn -DgenerateReports=false package

Have you tried (in child pom)?:

       <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-site-plugin</artifactId>
          <version>3.1</version>
          <configuration>
                <skip>true</skip>
          </configuration>
        </plugin>

---

Update. You can use property to redefine default behavior. Keep your children poms simple.
In parent pom set (pluginManagement or plugins section)

 <properties>
    <maven-site-plugin.skip>false</maven-site-plugin.skip>
 </properties>

   <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-site-plugin</artifactId>
      <version>3.1</version>
      <configuration>
            <skip>${maven-site-plugin.skip}</skip>
      </configuration>
    </plugin>

In parent pom just redefine maven-site-plugin.skip:

<properties>
    <maven-site-plugin.skip>true</maven-site-plugin.skip>
 </properties>