In September 2021, Hans, Gerda and Inga bought a 3-bedroom house in Hendon with all three registered as co-owners, all three contributing equally to the purchase price. Gerda has a four-year-old daughter, Petra, who shares Gerda's room and lives in the house as her school is nearby in Golders Green. Hans paid for a new bathroom to be fitted and wanted Gerda and Inga to contribute to the cost. However, this caused several disagreements and Hans decided to leave. He began to negotiate selling his share to Gerda and Inga, but negotiations did not get very far. Hans also suggested that Gerda and Inga pay him compensation for moving out and having to pay rent for a flat he was looking to lease.

Several months ago, Inga was short of money, and she mortgaged her interest in the house to Hendon Building Society. Sadly, last week Inga was struck by lightning in a freak storm while out walking in Golders Hill Park and died instantly. Inga had left a will in which all her property was to go to her sister, Juniper. Inga's only secured creditor, Hendon Building Society is seeking an order for sale of the house, but Gerda and Petra wish to continue living there, though Hans would like the sale to go ahead.

Advise Hans, Gerda, Juniper and Hendon Building Society.

the answer should be bases on land law co-ownership give the answer using IRAC method supporting it with relevant case laws and legislation.