I have been wondering about this question for a while now "What would it be like to have Lisa for a Sibling" well here are my thoughts:

Lisa: Having Lisa for a sister if she didn't star in the Simpsons would probably feel like any other sister, If we knew she was from the Simpsons she would be a person to look up to. Having Lisa for a sibling would be great at times, you could hang out with her, take her down to the libray, out for ice-cream ect. But what about falling's out if there were any, would they be over Lisa's views on Life, Her Buddhism or being a Vegetarian or even about Lisa herself but overall Lisa would be the perfect sister as she has proved from the Simpsons, she would always be there for you.

What do you think about Lisa for a Silbing?

Yes. Like Serge, I never had a sister, but only have a brother, so I don't even know how it "feels" to have a sister. My brother was more like Bart when he was young, and I was the "Lisa" in the house, so it would be great to have someone with a similar mind. 

I think it would be alot of fun. I've always wanted a sister... and having Lisa would be really neat.
I think we would be able to along pretty easily.
And maybe she would help me understand these damn algebra equations.

I have a sister and I am grateful for that, we have had the same kindo f relationship as most, the odd fight, arguements ect, but I am grateful I have one. I do not get on with my brother in the slightest, but my sister is different.

Having Lisa as a sister would be a difficult one though. I think I would rather have her as a friend, as as a sister I may not appreciate her personality in the same way. And dont want sibling rivalry destroy that. A cousin or another member of the family, yeah probably.

Then again if she was my sister, then reality would be different I woudn't know any better anyway

SimpReal
I'm sorry... and who knows how would you act if things came different way. No need to suspect the worst.
The "friend" and "sibling" terms aren't mutually exclusive. Unless you meant "girlfriend", which is different thing
*sigh* If Lisa was my sibling, we could cook for each other...

Sorry for the offtopic, but I think Maggiecute posted the 10800th post (not including deleted posts). 200 more to go!

Frink: "Oh... I forgot to er... carry the one..."

To the nearest thousand at least.

It totally makes sense, Dag. I decided to become a vegetarian when I was a teenager, so still living with my parents and younger sister. It would have meant SO much to me if I had someone in the family that supported my decision and truly understood me. But luckily I'm a stubborn girl so I stuck to it anyway. No looking back in regret, but yes it would have been wonderful (and so much easier for me) to have Lisa as a sister and share such an important cause.

I feel the same way. I like to protect people, but I've never had any siblings. It would be nice to have a little sister.

Same here. I've never had any siblings, but my cousin is like my older brother, since I've never been able to have one. 
(we still bicker like siblings, too )

ambercrystal
Wait a minute... is your brother older than you by any chance? If you bro is like Bart, and your sister is not like Lisa, maybe you're actually the "Lisa" in your family? Have you ever thought about vegetarianism, or alternative religions? Seriously, it's amusing to know that so much similar family relations exist in the real world.

That is a good theory Dagdamor. No, my brother is the youngest, but it could still work out that way. I am quiet and smart and my brother is annoying and my sister acts like a baby... she could be the Maggie. She is younger than me.

I think there's no need to fit the scheme 'old brother - younger sister' to be a 'Lisa' in family. Or to feel something like she. You can be a 'lisa-person' on your own, it's only a question of your personal qualities. If you are lonely, misunderstood, some intellectual and seek for a beauty in people and to learn more about this world, you surely is 'Lisa' already. I'm saying it and about myself too

I've got a sister, and I can safely say one is more than enough for me! LOL  I was always the "Bart" and my sister the "Lisa" in my family.  Lisa is someone I would rather have as a close friend rather than a sibling

To have Lisa as a close friend and to have her as a sibling could be very different things. I can say it from my brother's experience. When you have a sibling he (or she) have almost the same brains as yours, that true. Both you had the same parents, so your morality is pretty the same, your tastes quite associated. And even when there's differences big enough the attitude to that is like... to the somebody else's property. He listening to that style of music - so I must listen to another, just to spare my own personality. And such idiotism
Talking about Lisa as my sibling I say I must be pretty same like Bart to be her native brother. Or she must be similar to my 'alternative personality' if I want to be 'myself' with her. Or she simply can be my stepsister...
Anyway, the brothers and sisters are much closer to each other than any of best friends. Of course only in the childhood, 'cause getting adult means everyone became much estranged from each other. And that's a small tragedy I thnik.

I'd love to have Lisa as a sister! I have a sister and we often have arguments but they're not the standard brother-sister arguments, it's more. I know that cause she also very often has arguments with others. Lisa is pretty much like me - the biggest difference is the fact that she's a girl So I think Lisa and I would be very, veeery good friends as siblings.

SimpReal
No, she's not. And I think the most difficult thing about living with her would be a constant competition for greatness - Lisa is an overachiever, and unless you were the same, you would have to live in her shadow. I don't think being her brother would be a very fun experience.

But then again, some people like competing in that manner... so, more power to 'em.