This is probably most importantly answered by @Jin, but in looking at the site design, I find it difficult for users to find our most closely related sites.
Hermeneutics is a very, very close site, but as beta, it technically doesn't make the list. Beyond that, Judaism (Mi Yodeya) and Islam are, IMHO, our closest kin. Often when we say, this question is off-topic, those are the sites that we think are on topic.
One could argue that Philosophy, Skeptics, History, and ELU are also related, but definitely to a differs degree.
The question is, seeing that these sites are so closely related, is it possible to have these appear in our footer?