Yoshino... big brother figure or an uncle figure?

[crazyjosiah]

 i realized that Okazaki has a scarce amount of family  (just his dad and grandma)...(from finishing the Clannad anime  roughly a year ago ) i've  seen Sanae and Akio as more fufilling parent figures to Okazaki than his blood pops....I see Sunohara  like the brother that he never had...and seemingly Kyou besides being a potential lover,  all crushes  aside, sorta doubles as a sister figure.. Fuko is also like a little sister to Okazaki..Misae is like an auntie figure to both Okazaki and Sunohara. it kinda makes sense   being that Clannad is a family themed VN,, Ryou and kotomi are like the perfect sisters to Nagisa.....however i wonder about Yuuske Yoshino at first i thought he's like a big brother to tomoya but then i figured, at their age difference, he's more like an uncle  to Okazaki. both seem possible but i don't  know where to pin my finger on if i had to choose one.. what do you guys think as far as labeling a character outside Okazaki's bloodline with stand in family titles?   Yusuke Yoshino. big brother? or uncle?