I'm not into suggesting yaoi to preteens and definitely not into girly semes, but I have read plenty of yaoi with the men having/raising children so if you could just tell me if you're okay with that (I've read few where the uke is the one with children so I'm not sure if I could suggest many specifically.) Such as the prequel to Love Kids.
But a...... reply
If you don't mind some stray, I suggest Madness:
http://www.mangago.me/read-manga/madness/mf/v01/c001/
Anything and everything by Harada and Ogeretsu Tanaka:
http://www.mangago.me/read-manga/renai_rubi_no_tadashii_furikata/
http://www.mangago.me/read-manga/escape_journey/
The whole Kuroneko series. Here's the first:
http://www.mangago.me/read-man...... reply