You should probably use your address and phone number as his court-appointed guardian. Using "c/o" is optional. Basically, the personal information is used for IRS correspondence - which should most likely come to you and not your ward.
You can sign the tax return since you are his legal guardian and prepared the tax return on his behalf.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
