I knew a lot of Virgos Sun in my life. (at least 9 I think).
It's the sign I've met the most.
They are all differents. Your brother do the same kinds of things my mother do.. All the things about house details, being critical about food. Finding little insignificant non interesting things and working on it (like an obsession). And she talks a lot. She's very nervous. I think gossiping and criticizing people depends of the Mercury house and sign (and aspects). Venus too.
I know another person like that. A Virgo Sun girl very very talkative.
But more tolerant. She's psychologist and like to help people a lot. It's very important for her. It's a very clever and interesting girl. She's not criticizing anything, but gossiping yes. (but able to keep secrets, mine at least..). She always find a way to make people feel comfortable when they are with her.
I had 4 other virgo friends, 2 were very focused about work.
Love wasn't really important for them, only work was. They were very good with the skills they wanted to learn.. Hardworkers. If you ask a virgo an advice, he or she will give you. I think they were more "anxious" about themselves, so criticizing other people or gossiping all the time was not something they did. But those people were loyal and kind.
The last 3 ones, not gossiping or ultra focused about work.
The only thing that applies to all is I remember those 8 or 9 persons were all very polite and adaptative depending on the kind of context and situations.
So, in this 3 lasts ones. One was very shy (It was a friend of mine when I was at primar school. Virgo sun childs are often shy childs.)
The other one was a Virgo Sun, Scorpio ASC with Aries Moon. More secretive. I can't really describe him or his main interests. (because Scorpio ASC don't really want to tell you). All I can say is that he was hypocondriac and very anxious about health. But destructive for himself (scorp asc + aries moon)
The last one was my bestfriend when I was a teenager.
Not so talkative or criticizing.
In all those virgos, only my mother criticize grammar or spelling mistakes.
I do it to. I'm not obsessed about writing but sometimes I even don't think when I do it. I just want to help people
But in English, I don't see any mistakes