It says, "family BACKGROUND."
Background IS one generation or more....and it was all catholic.
Technically, the Catholic faith, btw, was not overturned in England. The "Roman" variety of Catholicism was rejected.
The nation reverted to its Old English Catholic background that existed prior to William the Conqueror.
There is nothing "Catholic" about defacing sacred art; ruining monasteries and abbeys; executing monks; throwing out sacred vessels, altar linens, and other artifacts; banning practices like the veneration of the Cross upon pain of imprisonment, etc.
It's a nice little Anglican conceit that they were bringing England back to its true Catholic heritage, but if you look at what actually happened, it was a religious revolution.