Install my farm onto someone else's device?

I have a long developed farm but my iPad is too slow & old now (ipad2) so I use my phone for general playing.

However I've just had an op & will be bed bound for 2+ weeks & could play on my moms iPad. However she has a farm & it's installed on her iPad. How could I temporarily play hayday on there while I'm off work?

Hi, I presume you've already read the FAQ? but if not, look under "my account" and video tutorials here: https://supercell.helpshift.com/a/hay-day/?p=web

As I haven't tried it, I can't offer further advice, hopefully someone who has done it successfully will be able to help. From reading the forums though I can offer you the advice to Be Very Careful! To the best of my knowledge, Hay Day can only offer support to one farm per device and so you stand a big chance of losing one of the farms completely if something goes wrong. Your device/operating system simply may not allow two farms to exist on one device. To be most certain of what to do, I would contact the in-game support team and see what they say.

Playing your own farm on multiple devices is possible. I think that playing two farms on one device may not be possible.

Make sure you are signed into the correct Facebook account before trying to attach your farm to Facebook, by the way.

Hope someone else can be more helpful! :)

Are you and your mother friends with each other on Game Center and can visit each other's farm through GC?

I need to make sure both account are correctly linked to GC account before guide you to something. As pitchfork said, it could erase one farm from the device and complicate things it not done correctly.