I have a page with a standard controller that calls an extension showing the child and grandchild records. I used this template to create my vf page https://success.salesforce.com/answers?id=90630000000hKccAAE  (below) However, when I add a save button in the form, it only updates the fields in the object referenced in the standcard controller.

Controller

public with sharing class wrapperclass {
private final Opportunity SiteO;
public List<Account> accountList {get; set;}
public List<Contact> contactList {get; set;}
public wrapperclass (ApexPages.StandardController stdController)
    { SiteO = [SELECT Id, Name FROM Opportunity
                   WHERE Id = :ApexPages.currentPage().getParameters().get('id')];
    }
public List<Account> getAccounts() {
  if(accountList == null) {
   accountList = new List<Account>();
   for(Account a: [select Id, Name from Account order by Name limit 10]) {
    accountList.add(a);
   }
  }
  return accountList;
}
public List<Contact> getContacts() {
  if(contactList == null) {
   contactList = new List<Contact>();
   for(Contact c: [select Id, Name, Email, Phone from Contact order by Name limit 10]) {   
    contactList.add(c);
   }
  }
  return contactList;
}

}



Page

<apex:page standardController="Opportunity" extensions="wrapperclass" showHeader="True">
    <apex:form >
     <apex:pageBlock >
     <apex:outputText value="{!Opportunity.Name}"/>
         </apex:pageBlock>           
        <apex:pageBlock >          
            <!-- In our table we are displaying the cContact records -->
            <apex:pageBlockTable value="{!contacts}" var="c" id="table">
                <apex:column value="{!c.Name}" />
                <apex:column value="{!c.Email}" />
                <apex:column value="{!c.Phone}" />
            </apex:pageBlockTable>
             </apex:pageBlock> 
             <apex:pageBlock >
             <apex:pageBlockTable value="{!accounts}" var="a" id="table">
                <apex:column value="{!a.Name}" />              
              </apex:pageBlockTable>                     
        </apex:pageBlock>
    </apex:form>
</apex:page>

So, I added this code to my extension but it only updates the specific fields in that list
 

public PageReference saveAll() {
update contactList;
return null;

}

How can I save all fields in my standard controller AND in the fields I am calling from the extension?

Also, how can I go back to the detail page after saving? the "return null" brings me back to the visualforce page and I want it to go to the page where I have the button. 

I am looking for the simplest answer here as I am not a developer.