They define poverty as 'not being able to heat your home, pay your rent, or buy the essentials for your children. It means waking up every day facing insecurity, uncertainty, and impossible decisions about money. It means facing marginalisation – and even discrimination – because of your financial circumstances. The constant stress it causes can lead to problems that deprive people of the chance to play a full part in society.'
Poverty is when your resources are well below your minimum needs.
www.jrf.org.uk
They define 'relative poverty' as 'where households have less than 60% of contemporary median income'.
The median household income in the UK is £29,400.
If you are earning less than 60% of that, (£17,600) and trying to raise children then it is very likely that you encounter much of what they describe above.