Update - SO FAR, so good. I took the check and my paperwork to my bank. They scanned in my Letters Testamentary - and had me endorse the check exactly as it was written. I deposited it into the account which has both my name and my father's (I've kept that particular account open for purposes such as these).
As of now, the check has cleared.
Thank you for your input and I hope this thread helps someone else as well. If I have any issues with the check going forward, I'll post here.
