That was an excellent explanation, thank you. Also regarding ojciec, I found this: http://en.wiktionary.org/wiki/ojciec#Etymology http://en.wiktionary.org/wiki/

That was an excellent explanation, thank you. Also regarding ojciec, I found this: http://en.wiktionary.org/wiki/ojciec#Etymology http://en.wiktionary.org/wiki/ojciec#Etymology The changing over time following rules was the missing part for me.