Most here, except for Roman Gousha and Kozure Ookami, I think, because they're not fluffy as far as I remember.
http://www.mangago.me/people/tag/133790/guys+with+kids/
Some of my favorites. :) I was super hooked on the single parent/father genre for a while!
http://www.mangago.me/read-manga/sorenari_ni_shinken_nandesu/
http://www.mangago.me/read-manga/koishite_daddy/
http://www.mangago.me/read-manga/himegoto_asobi/
http://www.mangago.me/read-manga/gochisousama/
http://www.mangago.me/read-manga/ikumen_after/
http://www.mangago.me/read-manga/ookami_papa_wa_hitsuji_tsura_shite_yatte_kuru/
http://www.mangago.me/read-manga/tone/

Can anyone recommend family based yaoi? I adore fluffy stories where there's a single father or a guardian looking after a young child finding love. Stuff like 'family situation', 'Motoyan Papa to Hitsuji-sensei' and 'Sensei wa Butchozura Shite Yatte Kuru'.
Can anyone make any suggestions?? Thank you! (= ^ ω ^ =)