Yes. While it is usually not advisable, it is legal. When there are co-administrators, they both have to be around to sign all documents and checks. You will be hard pressed to find a bank that will allow you to demand two signatures on a check. Also , without proper language in a will, you might leave one administrator serving alone or with someone appointed by the probate court if both people cannot or do not want to serve. As you can tell, both administrators will need to live nearby. I would suggest not doing it, but it is legal.