There are some aspects of David Cameron's suggestions about fathers looking after kids that I approve of. I do think that father's should be expected to put in the hours in terms of parenting as much as mothers. At the moment if a child is found abandoned on the streets - the mother is prosecuted, clearly it would make more sense if both parents were prosecuted. The idea needs more consideration though. We need to look at the 25% of women in this country who experience domestic violence. Clearly these women need the same level of support but not from their actual partners.
His second point - tax breaks (more tax breaks) to "help families stay together" is nonsense. It's much cheaper to share accommodation than to live alone, there are inherent savings in having a live-in partner. This really amounts to bribing people to stay in relationships that may not be working out. Those relationships are not the kind of places children benefit from growing up in.
We have to steer away from making rules that mean support is reduced for "unconventional" families: single mums and dads, step-parents, extended families and co-habiting partners and friends. children are best raised in happy homes, well above the poverty line. Biological parentage is not what counts.