I would say that the "family" designation is only a name. It does not mean that anything new has to be added or omitted from an existing system. All systems change from one generation to the next. If the training system is passed down to two or more generations within the same family it can be thought of as a houshold ga/jia system.
A reason for not observing the jia status is to honor the greater lineage. Often the lineage holders see their heritage as being as valuable as the functional skills within a system. You can argue that skill shoud be more important but you can't really argue with cultural values.
And some so-called ga systems are not really family styles at all, e.g. Hung Ga and Fut Ga.
"Look, I'm only doing me job. I have to show you how to defend yourself against fresh fruit."
For it breeds great perfection, if the practise be harder then the use. Sir Francis Bacon
the world has a surplus of self centered sh1twh0res, so anyone who extends compassion to a stranger with sincerity is alright in my book. also people who fondle road kill. those guys is ok too. GunnedDownAtrocity