GOY EL GOY

 The Goy needs to sell his חמץ to another Goy (otherwise it will be חמץ שעבר עליו הפסח)

                                        GOY EL GOY 

1) The Halacha of, a wife's assets belonging to her husband,
is not applicable if the husband is a Goy.
 
A Goy who is ch"v married to a Jewess we apply the rule of
דינא דמלכותא (Law of the land) and 50% of the assets
belong to the (Jewish) wife, (Harav Y.S. Elyashiv zt"l)

Therefore their Chametz needs to be sold to another Goy, 
for it not to become חמץ שעבר עליו הפסח
(ie: A Goy who is a partner with a Yid, their חמץ must be sold) 

2) A Goy who will be becoming a Ger on Pesach 
.