The cousins are the same generation as my husband, a baby boomer. The culture was no different for them than it was for my husband and I. There was little contact between the different cousins, each family growing up under separate conditions. The children of the one family with only one gay son, claim that their parents were wonderful. You cannot blame this on molestation.
Even so..homosexuality is not genetic....yet if you consider your statement that they were raised by baby boomers, the sexual revolution era, that could have to do with how they were taught.
Again...most of those who claim to be homosexuals today..aren't...they are simply rebelling and experimenting as their parents did in their era using sex. Unfortunately, as with any vice abused, one can get in so deep they cannot get out without assistance. Sin brings forth death in the end if it's not stopped.