There are two mom families, two dad families, single (gay) dad families at Oyster-Adams. I can't speak for them, or the rest of the school community, but no one seems to care about the sexual orientation of any parent, gay or straight. The kids of these families are treated as any other, from my experience.
In the middle school, the counselor started a group for LGBT students (don't know the particulars of the meetings or how well they were attended, but the group was for all students regardless of orientation--support for those who identified as LGBT, and support from straight kids).
There are gay faculty and staff at both campuses, and the administration supports them, as well as gay families. Oyster-Adams had a nice showing in the DC Pride March last year, with the principal walking alongside families from the school.
O-A isn't perfect, but this is one area where they get it right.