Translation:His older sister is a college student.
Ane, ani, imooto, otooto, haha, chichi, baba, jiji are used for your own family. Oneesan, oniisan, imooto, otootosan, okaasan, otousan, obaasan, ojiisan are used when talking about someone else's family members OR if you are being polite/nice to your own family members eg. Like the difference between Mum and mother, Dad and father, bro or sis and brother or sister. Also, you might refer to someone older than you - a friend/someone you're familiar with as your oneesan or oniisan. And people regularly address elderly people regardless of whether they know them or not as obaasan and ojiisan.
You use あね when your talking to other people about your older sister. You would use お姉さん (おねえさん) when talking to someone about their own older sister. Additionally, you can also use お姉さん when speaking to your older sister directly, like a title.
あの人は、お姉さんですか? [Is that person your older sister?]
私のあねは大学生です。 [My older sister is a college student.]
姉さん、今何時？ [Sister, what time is it now?]
The お makes it a bit more polite.
Formality and respect.
かのじょはわたしのあねです。 [talking to someone, she is my older sister]
おねえさん、ただいま。[to your older sister, big sister, I'm home]
Similar in difference between お母さん(おかあさん) and 母(はは).
Generally, words that start with お and are about a person, お母さん 、お父さん、お姉さん、お兄さん、お医者さん、etc are about respect.
At least that's my understanding of it.
shimai - sister, kyoudai - brother/siblings (this is quite common in many languages where the masculine can mean brother or sibling/s). I like that Japanese has specific words for older brother/sister and younger brother/sister. Incidentally oniisan/oneesan can be used to refer to a close friend or a close family friend, often older than you - just like in English when you have close friends and your children refer to them as Auntie and Uncle even though you're not related to them at all.
Neither are japanese terms. The english translation of 大学 is ambiguous, because there's really several distinct english dialects, with different terms for the place the highest level of education happens at.
In american english, it would be college. In british english (and most of the english speaking commonwealth) it would be university.
This should help, both as to the terminology and, perhaps more significantly, concretely what the things are the terminology references: https://en.wikipedia.org/wiki/Higher_education_in_Japan
I wrote everything right but instead of "college" i said "university"....it marked it wrong. I'm confused.
Before it was "university" now apparently is college. Can someone please explain?
The reason is that the Japanese words mean specifically that - so, not irrelevant but rather accurate translation. いもうと（さん） - younger sister, おとうと（さん） - younger brother, おねえさん (あね) - older sister, おにいさん (あに) - older brother. English may not have words specifically point out the age of our siblings but Japanese does.
My understanding is that university and college mean the same thing HOWEVER in The States College is more commonly used to mean University. In NZ College is sometimes used to mean high school but never University. I am guessing that the same goes for Spanish as colegio refers to high school and universidad to university. But I have also learnt something new from piguy3's comment about colleges encompassing a broader definition of tertiary education institutions. In NZ our tertiary education institutions are University and Polytech (Polytechnic), although there are other institutions that offer more specialised or focused curriculum like Arts Schools, Schools specifically for Hospitality, Hairdressing etc etc
In the U.S. "college" refers to "university" pretty much only in the expressions "college student," "in college," "go to college" (there might be a few others). These do happen to be very common expressions, but outside these limited contexts, the words are actually even more different than I mentioned above. In fact, "universities" are made up of "colleges": College of Arts and Sciences, College of Engineering, College of Agriculture, College of Business are constituent elements of a university. (The word "school" is also used in this way: law school, business school, medical school.)
Education, and higher education perhaps even more so, is one case where native speakers of English from different countries might just as well be speaking different languages half the time (which tends to make the relevant portions of Duolingo trees o so fun, and confusing).
Yes, we also use law school and medical school in this way - but they are still part of a university. Also, I forgot that we DO use college in a tertiary education situation - we have college of education - where you study to become a teacher at any level - early childhood right through to secondary school level. But in the city that I live in the college of education has become part of the University.
In the US, the term "university student" simply isn't used much. "College student" is used in its stead. In principle, "college student" is a little broader, encompassing students in post-secondary educational institutions that aren't universities (e.g. liberal arts colleges and community colleges). I have no idea if there are any similar distinctions within Japanese higher education.