Considering that I know hundreds of heterosexual families who are raising children, and only 3 homosexual families, that’s hardly statistically unexpected. I don’t think there’s any objective evidence to support your claim that lesbians have a higher incidence or domestic violence, substance abuse, or being victims or perpetrators of crime than the general population. Domestic violence is overwhelmingly male-in-female, and violence in general is overwhelmingly perpetrated by males.
Same-sex cohabitants report significantly more intimate partner violence than do opposite-sex cohabitants. Among women, 39.2% of the same-sex cohabitants and 21.7 of the opposite- sex cohabitants reported being raped, physically assaulted, and/or stalked by a marital/cohabiting partner at some time in their lifetime.
Patricia Tjaden & Nancy Thoennes, U.S. Dep't of Just., NCJ 181867, Extent, Nature, and Consequences of Intimate Partner Violence: Findings from the National Violence Against Women Survey, at 30 (2000), available at http://www.ojp.usdoj.gov/nij/pubs-sum/181867.htm