My goodness yr c6 twist the facts. Yr family gift u gold right? If u want to get yr own things it's 貼外家?? If 62/99/c6 gift the gold then maybe just maybe they have a pt. But this is total crazy.
Try not to show anger now, u must get back what belongs to u first. Can u say to c6 that they've misunderstood, u only want the gold for sentimental reasons, nothing to do w/ trust. You're preparing yr own safety box for the many children u'll have for them, right? Use whatever excuse sisters here have suggested, they're really good. Once u get yr things back, rethink yr whole situation. I hope all works out la.