Thought I'd start a new thread on this as there have been several interesting comments in the Erin Pizzey thread, which has rather gone off course.
As far as I can see, accusations that 'feminists want to destroy the family' are generally right-wing arguments derived from a fear of losing male supremacy within the nuclear family unit, and of having light shone on the more unpleasant, controlling and sometimes abusive practices hidden within many family set-ups.
Personally I don't see what's so great about 'the family' per se - it's like any institution, some families are lovely, some are horrible, and all of them (in my experience) gain from their members having strong connections with people outside the family. I don't even know how to define family in the modern world, it covers such a multitude of set-ups and relationships.
I'm rambling now but do come and add your perspectives!