When we got the grandmother she ran in under the couch and then we didn't see her for three days. She was always kind of anxious about everything, but she didn't really hide after that as long as one of her "safe people" were around.

Her granddaughter (when we got her a few years later) wandered out of her cage, looked around, and went "Yeah, sure, I live here now, and you guys belong to me".

She would however pick one guest and stare at them when we had visitors. And follow them around.