Well I just read Sorenari ni Shinken nandesu..a yaoi manga...for those who don't know this manga here is a short summary:
A father is raiseing his little daughter alone and then ends up with another man...they start to live together and raise the little girl together.

What I'm looking fore is a story about a girl being raised by a gay couple...something likea story about the live of the little girl in Sorenari ni Shinken nandesu (maybe her High School life or sth. like this)

Well I don't know if something like this exists but I think it would be really interesting to read ^^

i would look under the Homoparentality tag

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currently reading: Nyotai-ka
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Cherish the girl is starting university

Most or all of those are Yaoi, is there one that's about two women raising a kid or kids?

I don't know anything that fits (sorry!), but I just wanted to let you know - I'm pretty sure that none of the manga under the 'homoparentality' category actually focus on the lives of the kids - they're probably about the gay couples themselves (since they're yaoi manga).

What an interesting topic!

The only thing I can think of right now is a recent American movie: The Kids Are All Right.

I'm keeping an eye on this one...

I'm not sure if this helps, but this is the first time I noticed the LGBT Parent tag.