I don't know anything about the family, but I may be able to locate the property for you. I've found it on an early (c1870) OS map, but am having trouble locating it on a modern map. I've found an adjascent property, Tyddyn Ucha, on a modern OS map. This is south of Moel y Crio, which is South West of Halkyn.
If you wish, I can send you the old map, either as a PM or to your e-mail address. I'm not sure which will work.
Tecwyn
