diff --git a/lib/get.js b/lib/get.js
index 8fb0710b..6bdf092f 100644
--- a/lib/get.js
+++ b/lib/get.js
@@ -54,15 +54,24 @@ function* get(url, options, globalOptions) {
   return result;
 }
 
+const RETRY_CODES = [
+  'ETIMEDOUT',
+  'ECONNRESET',
+  'ENOTFOUND',
+];
+
 function* _get(url, options, retry) {
   try {
     return yield urllib.request(url, options);
   } catch (err) {
     retry--;
-    if ((err.code === 'ECONNRESET' || err.code === 'ENOTFOUND' || err.message.indexOf('socket hang up') >= 0) && retry > 0) {
-      debug('retry GET %s, retry left %s', url, retry);
-      return yield _get(url, options, retry);
+    if (retry > 0) {
+      if (RETRY_CODES.indexOf(err.code) >= 0 || err.message.indexOf('socket hang up') >= 0) {
+        debug('retry GET %s, retry left %s', url, retry);
+        return yield _get(url, options, retry);
+      }
     }
+
     throw err;
   }
 }
diff --git a/lib/install.js b/lib/install.js
index d784f40c..e1624900 100644
--- a/lib/install.js
+++ b/lib/install.js
@@ -126,6 +126,7 @@ function* _install(parentDir, pkg, options) {
   // 4. link bin files
   // 5. link package to node_modules dir
 
+  let grandfatherPkg;
   try {
     yield preinstall(realPkg, realPkgDir, options);
     // link bundleDependencies' bin
@@ -142,6 +143,26 @@ function* _install(parentDir, pkg, options) {
         if (bundledDependencies.indexOf(childPkg.name) !== -1) {
           continue;
         }
+        // if version format "n.x", check grandfather's dependencies
+        if (/^\d+\.x$/.test(childPkg.version)) {
+          if (!grandfatherPkg) {
+            grandfatherPkg = yield utils.readJSON(path.join(parentDir, 'package.json'));
+          }
+          const version = grandfatherPkg.dependencies && grandfatherPkg.dependencies[childPkg.name];
+          if (version && /^[~\^]\d+\.\d+\.\d+$/.test(version)) {
+            if (semver.satisfies(version.substring(1), childPkg.version)) {
+              options.console.info('[%s] use grandfather(%s@%s)\'s dependencies version: %j instead of %j, parent: %s@%s',
+                chalk.yellow(`${childPkg.name}@${childPkg.version}`),
+                grandfatherPkg.name,
+                grandfatherPkg.version,
+                version,
+                childPkg.version,
+                realPkg.name,
+                realPkg.version);
+              childPkg.version = version;
+            }
+          }
+        }
         tasks.push(install(realPkgDir, childPkg, options));
       }
       yield tasks;