Adopt a sibling for Charli?

My Charli is a smidge over 9 months old.   An opportunity has arisen where a friend of my daughter has to rehome her 1 year old male kitty.  (She travels too much with work, and needs to rehome her kitty.)

I'm wondering if Charli would appreciate a brother? (Charli is female)

We do work a lot, although it's here on the property (farm store) so we are in and out throughout the day, but mostly out.  We thought maybe some company to play with throughout the day might be good?   We got her at 6 weeks, and we have regretted not taking two at the time we took her. 

She is our little princess right now, though, don't know if it would be upsetting to her to have another or if she would like it.    I do have a feral that lives on my deck, and they adore each other, they play through the slider glass (he's REALLY feral, been with me 5 and a half years, but can't ever touch him and we've exhausted all efforts to get him inside, so he lives in a heated home on my deck).

Thoughts?

Thanks.

Most cats do learn to get along with each other.  Yet cats are very territorial.  All of the space inside your home belongs to Charli.  Now she will have to share it with a newcomer.  This is where problems arise.  There are methods of introducing cats to one another.  If you follow the process and don't rush the steps, the cats will have a better chance of learning to get along.  Some cats will like each other right from the start.  Other cats will take weeks, months or longer to learn to live together.  When the new cats comes to your home, it is best to have a separate room where he can learn to live in your home.  This room should be somewhat cat proofed.  You don't want him hiding under the bed where you cannot reach him.  He will need a place to hide or feel safe such as a hiding box or even a cat tree with a hiding box.  It would be great if you could get some of his belongs from his current owner.  His own scent will comfort him. 

I will post some articles on cat to cat introductions.  As I mentioned the key is not to rush the steps and watch for cues such as hissing, growling, ears going flat, posturing, tail swishing, etc...  If you rush the steps, you will end of having to start at square one where the process will take much longer. 

http://www.catbehaviorassociates.com/a-simple-little-trick-to-use-during-new-cat-introductions/

http://www.aspca.org/pet-care/virtual-pet-behaviorist/cat-behavior/introducing-your-cat-new-cat

http://jacksongalaxy.com/2010/10/01/cat-to-cat-introductions/

http://www.thecatsite.com/a/introducing-cats-to-cats