Good Monday evening Gary, Andrew, Paul, and Matthew!
Gary, that's a great picture of the great horned owl in your palm tree! BTW, owls are "horned," JUBBERS are "horny!"
Matthew, I believe Gary's Mexican fan palm is the Washingtonia robusta, which is tall and is planted in Southern California and Florida. It has thorns on the branches like a Washingtonia, but the leaves are dull and grayish, and they hang down ribbon-like. I was under the impression that Washingtonia leaves were glossy and stiffer. If I saw a picture of the whole tree, it might be clearer to me. There is also a tree called Sabal mexicana, or Mexican Sabal palm, a close relative of the Sabal palmetto of the SE United States, which is also a fan palm.
There are two varieties of Washingtonia which are frequently planted in Southern California, the Mexican fan palm, and the California fan palm (Washingtonia filifera). The Mexican fan palm is frequently planted in Florida, but the California fan palm is rare. I visited the Los Angeles Arboretum several years ago, and noticed that they curiously planted one Mexican fan palm and one California fan palm together, in a repeated pattern around the garden. Apparently it was done was back in the 1930s or so, and now they've all grown very tall.
Paul, it wouldn't surprise me that your grandmother had a Mexican fan palm in Spain. Many palms will grow in a large number of tropical and subtropical climates.