In his defense:
1) He is like 1,000 years old. If you asked him how many countries bordered the continental U.S. he would struggle with that as well. The brain connectors are frying out at an alarming rate every day; and
2) When you own $13MM worth of homes, you might think that one of your homes should count as two or three or four and you might be correct.
And The Old Guy was probably a little afraid to answer the question since then he might be asked where the houses were physically located, bringing into play some fear that he might begin his answer with, "The Lousiana Territory, Oregon Territory, that area Mr. Gadsen just purchased for us for $53,000,000, the Indian land we hold for them north of Texas...."