That's a famous photo (to old people like me). The orig has a 4 letter equation on the board, R-something = O-something. It's likely from the early years after his permanent move to the US in 1933.
If Cameron gets the credit, his 1963 book is 8 years after Einy's death, so who was there to agrue?
WhyTH am I being serious?
Always call the place you live a house. When you're old, everyone else will call it a home.