Very hot!
Thanks for that - and thanks to your mum and dad for such good work
As for everyone who's heckles are up - do we really need to moralize?
The mechanism by which we are conditioned to avoid incestuous contact (for the greater good of our genetic diversity) is part biological part social - the biological component of which has a direct neurological effect on our psychology creating an implicit need to become overly familiar with our siblings, which reduces the likelihood of sexual curiosity and attraction. The social element, which is created through this psychological effect is the moral and pseudo-ethical taboo placed on attributing sexual characters to our siblings - hence the reactivity, which is mostly an attempt to isolate someone who's behavior deviates from the expected mean - isolation in a social species is one of the greatest negative incentives, and is the primary mechanism of all bigotry and biases, intentional or otherwise. Even amongst a community of fetishists such as ourselves (who are fairly left of center as a group) there is that same capacity for reactive isolation.
I think the point I am trying to make here is that who really cares what he says about his sister's feet - he's not doing her any harm and it's perfectly natural to use descriptive terms such as "hot" when describing someone you know to be attractive, regardless of how they relate to you. Surely despite not having that particular sexual urge towards someone you are related to, you could objectively know if they are "hot" or not - and if you can say that you really wouldn't know - then you are probably acting in some way that is directed more by the guilt of being "weird" than the actual lack of that knowledge.
showing off his sisters feet is a good thing because he's clearly proud that she has them - I'm sure none of you would feel bad about being related to someone attractive - and HA, how would you know they were attractive anyway if you weren't "looking" haha
Peace and love and open minds!