Thanks for your reply! Your story is quite familiar! I don't know enough about the complete family history to say whether or not you're related, but Wixted is a very rare Irish name, and Ryan is a very common one. I was looking to find my Ryans by way of the Wixteds for that very reason.
Do you know where in Ireland your grandfather was from, or whether he had any siblings? You can email me directly if you prefer- firstname.lastname@example.org