Ruth and Dave Hall bought their home in Lincolnshire for £169,000 in 2008 but it is now being sold for just £137,000.
She told Business Editor Laura Kuenssberg that she believes they should never have been lent that money in the first place as the house wasn't worth it and they couldn't afford it.
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Kate will join Prince William on a tour of the Stephen Lawrence Centre before visiting a charity working with disadvantaged young people.
There is an "urgent need" for a "simpler and more trusted" system for investigating clinical failures, according to a damning report.
Over 100 mothers and fathers were investigated for leaving their children unsupervised in the final three months of 2014, new figures find.