There is no such thing as a family coat of arms since these are only granted to an individual and his direct male descendants. However, the fact that a family has used a coat of arms, authentic or otherwise, is a part of the history of the family. The following is an example of shield and crest used by at least one branch of the CATTLEY family. (Note the colours are not necessarily true as they have been lightened to show detail.)
Photo : C.L. Patricia Cattley Bray
This shield comes into the category of a "canting seal of arms" in that it features the cat - so making a pun on the CATTLEY name. The cabled anchor suggests sea-going connections as one might expect of Russia-merchants reliant on shipping for their living.
