Absolutely.  It is a very common practice to name an attorney as a co-executor.  Even in situations where there is no question about the ability of the executor/family member to perform her duties, people often name attorneys because the probate process can be tricky and time consuming.  On a related note, I know it can be hard to talk to family members about these issues, but allow me to give you a little pep talk:  This is about you and your wishes and your sister needs to understand that.  Hopefully, she will assure you that you need to do what makes you comfortable, but if not, you still need to move forward.  Good luck.  For more information or to post a question, visit our Massachusetts Estate Planning Discussion Forum.