Being gay was illegal in the UK until 1967. He chose to be chemically castrated rather than go to prison.

在1967年之前，同性恋在英国是非法的。他宁愿被化学阉割也不愿坐牢。

So, they come to the conclusion that their father is going to castrate them because of their illicit love for their Mom.

因此，他们得出的结论是，由于他们对母亲的不正当爱恋，他们的父亲将阉割他们。