All government policies will have to pass a “family test” under plans due to be announced by David Cameron.
The Prime Minister will use a speech to admit children and parents have often suffered as the result of legislation.
From October, Whitehall impact assessments for policies will have to formally consider their affects on families, alongside factors such as cost effectiveness and the environment.
Mr Cameron will also announce figures that show adoptions have increased by a quarter following efforts to improve the system – and a doubling of funding for relationship counselling through Relate, to 19.5m.
“I want every government department to be held to account for the impact of their policies on the family,” the PM is expected to say.
“The reality is that in the past the family just hasn’t been central to the way government thinks.
“So you get a whole load of policy decisions which take no account of the family and sometimes make these things worse.
“Whether it’s the benefits system incentivising couples to live apart or penalising those who go out to work or whether it’s excessive bureaucracy preventing loving couples from adopting children with no family at all.
“We can’t go on having government taking decisions like this which ignore the impact on the family.
“I said previously that we would introduce a family test into government. Now that test is being formalised as part of the impact assessment for all domestic policies.
“Put simply, that means every single domestic policy that government comes up with will be examined for its impact on the family.”
The speech comes as the Government prepares to launch an extension of its programme to tackle troubled families, set up by the Prime Minister following the 2011 riots across English cities.