The point is not what you think though, it's what they think. It reads to me exactly like the kind of "traditional values" guff that the Tories were on about in the 90s, or the American Christian right use to demonise gays and single mothers. Might they mean something else by it? I suppose so, but surely you'd expect them to make that clear, given the substantial cultural precedent and context in which statements like this will be read. Meanwhile, in terms of what they've actually said:
The tax and benefits system shall offer greater protection and support for family life. Couples raising children together (comprising a basic rate tax payer and a non tax payer) will benefit from full sharing of tax allowances.
COUPLES raising children together. No mention of using the tax system to help single mothers.
The fundamental aim of national housing policy shall be to ensure that young people seeking to start a family and have children will be able to find a suitable, affordable home in which to do so.
Young PEOPLE wishing to start a FAMILY. Pretty sure that means couples wishing to do it together. No mention of housing priority for single mothers.
This is textbook social conservatism. Attempts to read it as something else just seem like wishful thinking. Although you could always contact them and ask, I suppose.