Is there any uke who has a relationship with seme’s brother(like a substitute) because h...

there are plenty of that

http://www.mangago.me/read-manga/shinsen_hinako/
http://www.mangago.me/read-manga/1_2_cigarette/
http://www.mangago.me/read-manga/priceless_honey/
http://www.mangago.me/read-manga/empty_heart/ - Seme

Uke loves father then gets son.
http://www.mangago.me/read-manga/manatsu_no_zanshou/
http://www.mangago.me/read-manga/kimi_ni_yori_nishi/
http://www.mangago.me/read-manga/because_of_you/?av=1

With love, Uke wants to be substitute. - Give better vibe.
http://www.mangago.me/read-manga/empty_heart/
http://www.mangago.me/read-manga/haitoku_bl/