Have got two cats, male and female, had them from kittens, both from the
same litter for about 4 years.

The male, we rarely see. He comes in for food every now and then, once
he's eaten, he's off again, sometimes we don't see him for weeks at a
time.

The female spends most of the days outside, except for mealtimes, can
always be found very close to the house, she never goes very far, always
comes in at night, she likes her home comforts :-)

We have now got a new kitten, a male. Our older male cat has yet to put
in an appearance so hasn't met the new arrival so far. The female is not
too impressed with the new kitten. For the first couple of days, she was
off her food, although she is eating normally now. In the evening she
normally comes into the living room and sleeps on her favourite chair.
Now, she is very reluctant to come into the same room as the kitten. She
hasn't attacked him or anything, although she keeps a very sharp eye on
him, and will hiss at him, if he gets too close. The kitten is wary of
her, but doesn't seem frightened and he will attempt to approach her,
although not too close. They spend a lot of time staring at each other
from about 3 or 4 feet apart :-) Then the older cat will slink off into
another room and we won't see her for the rest of the evening.

I guess the older cat is just feeling jealous, after pretty much having
the run of the place to herself for so long. Is there anyway we can get
them to get along together? Will the older cat eventually get used to
the kitten? Any tips?