Wind is not a neccesary element in this clan. Ryuzaki ... I mean, L (XD), there are only 5 chakra element types which combine together to form other elements. Usually, a individually can only control one element naturally (Jonin are seen to be able to control two proficiently due to intense training).
This 'clan' has command of water and it's many forms(thanks to minute lightning). At least that's the intention, for if this clan could use wind and water ... than that would be just a rip-off of Haku's kekkei genkai, which has been confirmed as a style that encompasses two elemental types of chakra.
Yamamoto's wood is created from the element earth and water, but he also has the 1st Hokages genes directly inserted him ... thus making him the only one capable of using Mokutan(Wood style).
If anyone in this clan happens to live and have the superior trait, they automatically have water to begin with(considering where the majority of the clan lives and all). Kekkei Genkai, bloodline trait, allows the creation of lightning base chakra as well even though most members of the clan should naturally create water. Thus, the genetics of members of this clan creates individuals with a disharmonious balance of chakra that can be forcefully expelled from any part of their body(but in limited quantity, thus a full body release of such chakra like Neji would be impossible) and manipulate the water molecule.
These are further explanations that I should have included, but failed to do so. >.>;; Please consider them. And yes, I like taking simple things and making them overtly complex and convoluted in an attempt to logically explain how the process works.