There's also a indirect but meanful part, the translation of LIBERI FATALI is "fated children". Wouldn't that kind of make a reference on how Squall was the fated children? I mean, Laguna could have married Julia and all, but by the destiny/fate/karma/whatever he ended up having Squall with Raine, and then Squall met Rinoa, which could have possibly been his sister.

Just my 5 cents though