CosmicComet
http://images2.wikia.nocookie.net/__cb20090926100153/marveldatabase/images/thumb/f/f3/Incredible_Hercules_Vol_1_124_Textless_Variant.jpg/250px-Incredible_Hercules_Vol_1_124_Textless_Variant.jpg
http://images2.wikia.nocookie.net/__cb20090701003102/marveldatabase/images/2/24/Pallas_Athena_%28Earth-616%29.jpg
vs
http://media.comicvine.com/uploads/0/77/127257-136424-heimdall_middle.jpg
http://images3.wikia.nocookie.net/__cb20100109165142/marveldatabase/images/thumb/6/61/Sif_Vol_1_1_Textless.jpg/200px-Sif_Vol_1_1_Textless.jpg
What sibling pair wins? I believe the Olympians are stronger, but Heimdall and Sif probably will cooperate better.
http://images2.wikia.nocookie.net/__cb20090701003102/marveldatabase/images/2/24/Pallas_Athena_%28Earth-616%29.jpg
vs
http://media.comicvine.com/uploads/0/77/127257-136424-heimdall_middle.jpg
http://images3.wikia.nocookie.net/__cb20100109165142/marveldatabase/images/thumb/6/61/Sif_Vol_1_1_Textless.jpg/200px-Sif_Vol_1_1_Textless.jpg
What sibling pair wins? I believe the Olympians are stronger, but Heimdall and Sif probably will cooperate better.