Is your husband really superstitious?
I say you sit your husband down when you have time and explain to him what the JREF Million Dollar Challenge is. Maybe even show him some Youtube videos of fakes being exposed by Randi.
Anyone who can prove that they have supernatural powers (to predict the future, find water with a stick - no digging allowed . . . ) can demonstrate their powers and win a million bucks. The One Million Dollar Paranormal Challenge has been around for decades. People keep claiming to be able to tell your future for under $100, yet no one will/can do it for a million.
Since no one has ever claimed this fortune, I think this is the most powerful way to plant a seed of doubt that might eventually convert people to reason. Hey! Maybe that fortune teller friend can claim it and help you buy your property. Suggest this to your husband and mother-in-law.
*There are plenty of very logical people who think now is the wrong time to buy real estate in Taiwan. I'm one of them.
1. Your MIL doesn't (seem to) like you.
2. She is controlling.
3. Your husband is an only child who does what Mommy says.
4. You're moving to Taiwan.
5. DON"T MOVE IN WITH HER!
6. Good luck!