  The evolution of triples has not attracted much attention in the literature,
although their evolution can be dramatically different from binaries and single
stars. Triples are quite common, and we find that for about 1% of the triples
in the Tokovinin catalogue of multiple stellar systems in the solar
neighbourhood, the tertiary star will overflow its Roche lobe at some time in
its evolution, before any of the inner stars leave the main sequence. For two
of these systems, Xi Tauri and HD97131 we simulate in detail this phase of mass
transfer, during which stellar evolution, gravitational dynamics and
hydrodynamics all play an important role. We have used the Astrophysical
Multi-purpose Software Environment (AMUSE) to solve these physical processes in
a self-consistent way. The resulting evolution, mass transfer and the effects
on the inner as well as on the outer orbit are profound, although it is not
trivial to predict the eventual consequence of the phase of mass transfer and
the appearance of the resulting system.
