Taking a cutting from a mounted plant is difficult and not for a first attempt. The roots should be attached to the mount and removal means breaking the roots.
The plant looks very much like Iwan Apple Bloosum 'Golden Elf' which is not an expensive plant and should be easy to find this summer when all the Orchid society shows begin.
A cutting may take 2-3 years to flower even more if you mount it. Whereas a 2 1/2 inch pot can flower in one year and finding one in bloom is not hard.
You can tell if your in-laws have the same plant because Apple Bloosum is yellow with an apple color on the back of the pedals. There are several other yellow daisy type Orchids.
