There is a book called “Beyond Gay” by David Morrison. He is one of the principle members of Courage, the only organization approved by the Vatican for dealing with people that have a same-sex attraction. (more info on Courage at
couragerc.org).
It talks both about being a Catholic and dealing with a same-sex attraction and being related to a person with a same-sex attraction, it deals with both cases where the person abides by church teaching and how to deal with those that do not abide by church teaching.
Also, any books by Father John Harvey, the Priest in charge of the Courage ministry can help.
Also as someone who has dealt with lots of young kids, just because someone may display mannerisms associated with “gay” people doesn’t mean they are. I have found that some kids that were raised without a male influence or in a family with a large number of females can have effeminate tendancies. They don’t necessarily mean they are “gay”.