My sim self's late son Andrew won the lottery while still living at home with his parents. He went to university with his sister Ayla and took his one million winnings with him. After Andrew and Ayla graduated university, Andrew split from his sister Ayla's household and built his own house across the street from his sister Sienna in Newcrest.
However, when i split the household of Andrew and Ayla up i forgot to transfer Andrew's one million back to him and Ayla ended up with Andrew's money and Andrew with not so much left after building his own house.