I've have two cats who are are brothers, (Max and Clyde) for the last
two years.  Recently Max ran away.  During this time Clyde cried and
whined alot and became extremely close to me.  Finally after two weeks
of searching I found Max.  I would have thought that when I brought
both brothers back together it would be one big happy family again,
but Clyde has been hissing and trying to fight Max ever since I
brought him back into the house.  I'm confused as to why this is
happening since they were so close before.

Just wondering if its possible that Clyde, my cat who did not runway,
has forgotten who his brother is, even though they've been together
for 2 years and only separated for 2 weeks?

Anyone have any similar experiences or recommendations on getting them
to like each other again?