I agree with offering money, but if they refuse, I would wait longer before snatching him because when he disappears, they will know that it's you or your mother in law that took them and there might be trouble.
As for health, if you can take him to a vet and get a check-up, that would be great. That way you'll know what issues you might be dealing with.
As for health, if you can take him to a vet and get a check-up, that would be great. That way you'll know what issues you might be dealing with.