Since you're using smtplib, you'll want to review the documentation for that SMTP library on how you specify multiple recipients. SMTP libraries vary in how they handle multiple recipients. Looks like this StackOverflow post has information about passing multiple recipients with smtplib: How to send email to multiple recipients using python smtplib?
You need a list instead of just strings, so something like this:
msgDic['to'] = ['abc@gmail.com','example@gmail.com']
So, your family variable is declared properly, and you shouldn't need to do anything to that.