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This paper attracts attention to the class of resolved triple stars withmoderate ratios of inner and outer periods (possibly in a mean motionresonance) and nearly circular, mutually aligned orbits. Moreover, stars in theinner pair are twins with almost identical masses, while the mass sum of theinner pair is comparable to the mass of the outer component. Such systems couldbe formed either sequentially (inside-out) by disk fragmentation withsubsequent accretion and migration or by a cascade hierarchical fragmentationof a rotating cloud. Orbits of the outer and inner subsystems are computed orupdated in four such hierarchies: LHS 1070 (GJ 2005, periods 77.6 and 17.25years), HIP 9497 (80 and 14.4 years), HIP 25240 (1200 and 47.0 years), and HIP78842 (131 and 10.5 years).

Dancing twins: stellar hierarchies that formed sequentially?