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://mffjiv.rlp.de/de/themen/vielfalt/rheinland-pfalz-unterm-regenbogen/weitere-ansprechpersonen/
https://www.queernet-rlp.de/category/allgemein
https://www.queernet-rlp.de/mitglieder-2
http://www.meingeschlecht.de/anlaufstellen/alle-angebote/angebote-nach-bundeslaendern/#DE-RP
https://www.dgti.org/beratungsstellen.html#rheinmain
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/