I'm in a second semester ASL class in college, and we recently discussed the sign "us two"/"them two"/"you two" where you have a K handshape and you shake it between the two people you're talking about. My professor (who is Deaf) used it in example sentences like
YOUR MOTHER FATHER THEM-TWO MARRIED?
YOUR BROTHER SISTER THEM-TWO GET-ALONG?
He also said that you can't use this sign between generations, like using it for your mother and your sister would not be considered "right". But this didn't fit with my prior knowledge, so I asked him about this situation: I'm standing with my parents, and I say to my mom that my dad and I went to a movie last night while she was at a meeting or something. I would sign US-TWO (dad and me) GO-TO MOVIE. He said that was fine, and that it was different than what we were talking about in class.
Am I missing something here? I just feel very confused. Thank you! (x-posted to deaf )