Friends son and ex partner split 8 months ago. They have a 5 yr old and a 3yr old. It took him 4 months to persuade her to sell the property. She wanted to stay in it, with son paying the full mortgage costs and child maintenance (the full amount as if he never had the children overnight) and council tax. Whilst he lives on friends sofa and they have the kids 3 nights a week and every other weekend.
He tried to just pay his half of the mortgage and maintenance, but she stopped him seeing the children. So he figured he'd just pay this stupid amount whilst the house sold to keep her sweet.
She has a part time job, as that's all she can make work around childcare apparently. So can't afford to keep the house alone.
Buyer was found. Searches complete. Exchange date set. Last night ex partner decides she's pulling out of the house sale.
What options does the son have please?