Churchill was the trade name for a line of O/U and SXS shotguns imported by Kassnar, now defunct. Many were made in Italy, some in Turkey, so it is hard to give a definitive Yea/Nae on them (similar to the Spanish shotguns so common in the 1950s-60s). In general parts are not available, and if you do find parts labeled as for a Churchill, it is uncertain whether or not they will fit at all, as they used the same name and model designation for shotguns of different manufacture and design. That said, they are generally a very pretty shotgun (nice wood, checkered, and rolled engraving on the receivers), and handle fairly well, and you might have an excellent gun for all around use.
Never try to educate someone who resists knowledge at all costs.
But what do I know?