1st Generation like Russell and the gang were beating the streets looking for converts.
2nd Gen "trying to hold onto the gains the first Generation made, I think the Second Generation actually produced more in our religion.
For 3rd Gen, read the the rest of the article, it's interesting.
http://www.crivoice.org/thirdgen.html "historians and sociologists have observed an interesting trend that occurs with groups of people, or in communities, or even in families. It is called the phenomenon of the third generation..."