I don't approve of his behavior... but I've dealt with enough kids and teenagers to totally understand it. Closed-mouth cousin kissing (say that ten times fast!) would have been something that my aunt (who used to run a shelter) would have 100% taken over drug taking, promiscuity, running away, self-harm, etc, with the kids she looked after. Heck, there were a pair of orphaned half-siblings there when I was younger, around 14-15, who briefly told everyone they were dating - and kissed lightly to prove it - because they had literally nobody else and were deeply paranoid that either one of them dating someone else would mean losing their last remaining family. Squicky to watch? Yep. Did she kick them out of the shelter? Nope.
Too long response, sorry! But I'm 95% on team Haato here, and hoping social services at some point had some sharp questions for that family - they don't like it when you misplace a kid. ;)