Nearly one-fifth of first-time buyers (FTBs) over the past 12 months have received financial help from family members.
A study carried out by HSBC has found that young adults are still using the bank of mum and dad in an effort to get on the property ladder.
However, 52 per cent of the people who have provided funds expect to get it back, while 73 per cent of these want interest to be paid on top of this.
Some 94 per cent of families in the north-west – the most of any region in the UK – ask for interest, while this figure drops to only 56 per cent in the south-east.
Peter Dockar, Head of Mortgages at HSBC, said: "Family support has become an important part of the FTB financing mix."
He added that to avoid any "unnecessary strain on relations further down the line", families should agree on the terms and conditions of the loan at the outset.
This comes after a Lloyds TSB property sales report discovered that house sales have increased in two-thirds of UK towns thanks to improved affordability in the last year.