I can't seem to identify this orchid + can I divide it?

[PeteB]

Hello everyone, I'm new here and would like to build a collection of orchids. I have a few already but I was wondering if I could grow some more from other plants that my parents own. I can't seem to find any tutorial on one particular plant, but maybe I'm just not looking hard enough.

I've attached photos of the plant - my guess is that I could take a sterilised knife and cut between the bulb and stem. They look like they may even break off.

Thanks!