I'd make a place to put the little one for time out and let Linda stay out.

Karen

That might be a tough one, since presumably any place she can jump or climb to,
he can too. Maybe a roost of some sort that has only room for one cat--if she
gets up there and he comes after, she can bat him away. He won't try to jump up
on top of her, will he? However, I expect in a couple months your problem will
be much less severe, since at eight or nine months he is not going to have as
much of that kitten energy and will be less rambunctious.

Buy or make a cat tree. They have steps that a kitten can't possibly
climb. Or add a ledger-board to extend your window sill out a little
further. Catz love windows and a wider sill might provide you with
just what the doctor ordered.  That's my advice. Take it or leave it.

                               IBen Getiner

I had bought a cat tree off eBay a couple years ago --- it had 2
shelves and a top shelf on a 5 ft pole (pole was a 4x4 square). Well
it wasn't very well made and fatty Alfred broke the shelves on day one
but the carpeted pole and top were still intact. It became the
ultimate in king of the hill. whoever made it to the top could easily
repel any others by just slapping at them as they tried to climb up so
they ruled the top.

My one kitty Xena has an ongoing health problem (autoimmune hemolytic
anemia) and sometimes she just doesn't feel like playing and the boys
(there are 3 of them) can get a little too rough for her sometimes.
She would go to the top of that tree and no one could bother her
there.

So I suggest a tree or shelf on the wall with only 1 way up. You could
make an angled pole or shelf to get up to it if a straight up were too
difficult for your kitty. Mine would have a little more trouble
climbing it in the days right after having their claws trimmed.

Mel

   This is exactly like Collette and Blaise. She is about 4 years old and
he is
  six months old and full of energy. He is learning very slowly that when
she
   is on the bookcase looking out the window or on "her chair", he cannot
win
   and she will fight very fiercely. He used to launch himself at her 5 or
6 times,
   give up for a while and then try again. Now he maybe tries just once or
twice.
   We tried distracting him with other toys (pretty successful, actually),
letting her
    go outside or making a Blaise-free zone (Collette is allowed in the
bedroom, but
    he is not or he is given a time-out in his room).

   Ann

I've had good luck with the small, carpeted cubby holes Petco sells for
about $20. They are round, mini towers with room for only one cat, and
they can easily defend the space. I am using several in cages for strays
and it gives them security.

BarB