Our family was attached for a time to the Kapuster and as well as to the Liadier. It seems that we have not been attached to Lubavitch since the passing of the Tzemach Tzedek. Some of us still stick to the nusach hatefilah and whatever minhagim that we are aware of. From my family history research it seems that there many more families like ours who originated in Latvia and Northern Lithuania who davened at Nusach Ari Shuls throughout the world but most either rejoined Lubavitch or were lost from Yiddishkeit in the Golus.