There is no way to know what changes you have already been exposed to, so it is not possible to know what “other” changes must be discussed. Therefore, I will generally address changes to the American family in the 1970s.
The biggest change to American families was that they were moving away from the traditional model in important ways. Before the 1970s, the great majority of households had consisted of a traditional nuclear family. In the 1970s, this changed radically. There was, for example, much more divorce. This, along with a rise in births out of wedlock, led to a rising number of households headed by a single parent. Divorce also led to a rise in the number of “blended families” such as was seen on the hit TV show “The Brady Bunch.” (Values had not changed enough to allow producers of “The Brady Bunch” to make either parent divorced. The man was a widower and the show did not say how the woman’s first marriage had ended.) There were also more families in which the parents were living alone because their children had grown up and left the home.
This move away from the traditional nuclear family was the biggest change to American families in the 1970s.