  We investigate the quasi-limiting behaviour of bisexual subcritical
Galton-Watson branching processes. While classical subcritical Galton-Watson
processes have been extensively analyzed, bisexual Galton-Watson branching
processes present unique difficulties because of the lack of the branching
property. To prove the existence of and convergence to one or several
quasi-stationary distributions, we leverage on recent developments linking
bisexual Galton-Watson branching processes extinction to the eigenvalue of a
concave operator.
