The interests of people who are lesbian, gay, bisexual, transsexual or intersexual are represented by organisations, for example the Organisation for Lesbian and Gay people https://www.lsvd.de/
Please visit https://soziales.hessen.de/integration/antidiskriminierungsstelle-hessen/herzlich-willkommen-bei-der-hessischen
for additional information.
If Your child is treated badly because of his or her sexual orientation, You can find support at http://www.vlsp.de/