Clive had enough aspiration points to pick up the Entrepreneurial trait. This allows him to get promoted faster at his job as a businessman. He made a promise to his family to build up their home to make way for the new family member. Before long, the family were able to pull together the §38k they needed to build this modest, 2 storey, 4 bedroom home.
(It's called Talula's House and it's in the Gallery under my EA id â€œbelledaisiesâ€)