Did my Chometz Sale include Oats?

For those children of mine who have “defected” to believe OATS to be chametz,
now they come to my house AFTER Pesach, and want to eat the oatmeal I have.

They wonder, " Hey, Dad, since YOU say oats is NOT chametz, did that EXCLUDE these Quaker Oats
from your sale???" And then, maybe FOR US, this is “Chometz after Pesach” and forbidden??

Or no, can we say that the sale that R. Blech of LW did would include anyone’s version of chametz…

Tell your children to ask their Rav.