Last year (when it was my first year at college) i could say i had similar issue, i didn't want to go home, but because it was my family that was upsetting me, I was going back to an empty house, no-one really cared about actually being at home, spending time together and you know,, random stuff that family usually does.
Anyway, i don't think you should absolutely go home every weekend, but i think it it would be nice if you would go home every once in a while (you didn't mention the distance between ur home and college?), at least for holidays - cause as you said, it's not the problem in your mom or sister and at least for holidays you should be together. I don't know why everyone are so "against" going home for weekends/holidays, I mean.. those are your parents, and if you are so lucky and you DO get along and have a nice relationship then there is no reason for you staying on campus.