I'm pretty sure ganders won't sit on a nest, so you probably have an Embden lady on your hands. Your best bet may be to just get a Pilgrim gander and keep the trio.
Snowy, you've probably already been asked this in the past, but does your Pilgrim gander have grey under his wings? The easiest way to know whether you have an Embden or not is to look for the grey. If there isn't any grey then you probably have an Embden. If you do have grey then it could be a...