Example of using <apex:repeat> to return child records in a VF email.

## BrandStudioProjectEmailTemplate.html
<messaging:emailTemplate subject="Project: [{!relatedTo.Name}] needs Jira key(s)"
    recipientType="User"
    replyTo="email123@industrydive.com"
    relatedToType="AcctSeed__Project__c">

<messaging:htmlEmailBody >
    <html>
        <body>
         <STYLE type="text/css">
               TH {font-size: 11px; font-face: arial;background: #CCCCCC; border-width: 1;  text-align: center }
               TD  {font-size: 11px; font-face: verdana }
               TABLE {border: solid #CCCCCC; border-width: 1}
               TR {border: solid #CCCCCC; border-width: 1}
         </STYLE>
                  <font face="arial" size="2">

        <p>Hey {!$User.FirstName},</p>

        <p>Below are the Brand Studio product(s) related to {!relatedTo.AcctSeed__Account__r.Name}'s campaign. </p>
               <table border="0" >
                 <tr >
                     <th>Project Task Name</th>
                     <th>Product Name</th>
                     <th>Start Date</th>
                  </tr>

    <apex:repeat var="pt" value="{!relatedTo.AcctSeed__Project_Tasks__r}">
                               <apex:outputPanel layout="none" rendered="{!pt.Brand_Studio_Product__c}">

                                    <tr>
                                    <td> <apex:outPutText value="{!pt.Name}"/></td>
                                    <td> <apex:outputtext value="{!pt.Product__r.Name}"/></td>
                                    <td> <apex:outputText value="{0, date, MM-dd-yyy}"> <apex:Param value="{!pt.AcctSeed__Start_Date__c}"/> </apex:outputText> </td>
                                    </tr>
                                    </apex:outputPanel>
    </apex:repeat>
       </table>
         <p>
         Click on the link to access the record and comment with Jira key(s) for Brand Studio products in Chatter:
          <apex:outputlink value="{!LEFT($Api.Partner_Server_URL_140,FIND('.com',$Api.Partner_Server_URL_140)+4)+relatedTo.Id}">{!relatedTo.Name}<br/> <br/> <br/>
            </apex:outputlink>
          Thanks,<br/>
          Industry Dive Accounting
         </p>


        <p/>
       <p/>
 </font>

        </body>
    </html>
</messaging:htmlEmailBody>

<messaging:plainTextEmailBody >
Hey {!$User.FirstName},

Below are the Brand Studio product(s) related to {!relatedTo.AcctSeed__Account__r.Name}'s campaign.


[ Project Task Name ] - [Product Name ] - [ Start Date ]
-------------------------------------------------------------------------

<apex:repeat var="pt" value="{!relatedTo.AcctSeed__Project_Tasks__r}">
[ {!pt.Name} ] - [ {!pt.Product__r.Name} ] - [ {!pt.AcctSeed__Start_Date__c} ]
</apex:repeat>

Search the Project Name {!relatedTo.Name}  in Salesforce to find the Project &amp; comment in Chatter with the Jira key(s).


</messaging:plainTextEmailBody>

</messaging:emailTemplate>
	<messaging:emailTemplate subject="Project: [{!relatedTo.Name}] needs Jira key(s)"
	recipientType="User"
	replyTo="email123@industrydive.com"
	relatedToType="AcctSeed__Project__c">

	<messaging:htmlEmailBody >
	<html>
	<body>
	<STYLE type="text/css">
	TH {font-size: 11px; font-face: arial;background: #CCCCCC; border-width: 1; text-align: center }
	TD {font-size: 11px; font-face: verdana }
	TABLE {border: solid #CCCCCC; border-width: 1}
	TR {border: solid #CCCCCC; border-width: 1}
	</STYLE>
	<font face="arial" size="2">

	<p>Hey {!$User.FirstName},</p>

	<p>Below are the Brand Studio product(s) related to {!relatedTo.AcctSeed__Account__r.Name}'s campaign. </p>
	<table border="0" >
	<tr >
	<th>Project Task Name</th>
	<th>Product Name</th>
	<th>Start Date</th>
	</tr>

	<apex:repeat var="pt" value="{!relatedTo.AcctSeed__Project_Tasks__r}">
	<apex:outputPanel layout="none" rendered="{!pt.Brand_Studio_Product__c}">

	<tr>
	<td> <apex:outPutText value="{!pt.Name}"/></td>
	<td> <apex:outputtext value="{!pt.Product__r.Name}"/></td>
	<td> <apex:outputText value="{0, date, MM-dd-yyy}"> <apex:Param value="{!pt.AcctSeed__Start_Date__c}"/> </apex:outputText> </td>
	</tr>
	</apex:outputPanel>
	</apex:repeat>
	</table>
	<p>
	Click on the link to access the record and comment with Jira key(s) for Brand Studio products in Chatter:
	<apex:outputlink value="{!LEFT($Api.Partner_Server_URL_140,FIND('.com',$Api.Partner_Server_URL_140)+4)+relatedTo.Id}">{!relatedTo.Name}<br/> <br/> <br/>
	</apex:outputlink>
	Thanks,<br/>
	Industry Dive Accounting
	</p>


	<p/>
	<p/>
	</font>

	</body>
	</html>
	</messaging:htmlEmailBody>

	<messaging:plainTextEmailBody >
	Hey {!$User.FirstName},

	Below are the Brand Studio product(s) related to {!relatedTo.AcctSeed__Account__r.Name}'s campaign.


	[ Project Task Name ] - [Product Name ] - [ Start Date ]
	-------------------------------------------------------------------------

	<apex:repeat var="pt" value="{!relatedTo.AcctSeed__Project_Tasks__r}">
	[ {!pt.Name} ] - [ {!pt.Product__r.Name} ] - [ {!pt.AcctSeed__Start_Date__c} ]
	</apex:repeat>

	Search the Project Name {!relatedTo.Name} in Salesforce to find the Project & comment in Chatter with the Jira key(s).


	</messaging:plainTextEmailBody>

	</messaging:emailTemplate>