Durian belong to the botanical family:

Durian belongs to the botanical family Bombaceae.
It is the edible fruit of several tree species belonging to the genus Durio. Durian (Durio zibethinus), locally referred to as the “king of fruits” is a dicotyledonous tropical seasonal plant species belonging to the member of family Bombacaceae and the genus of Durio.
Durio is often included in Bombacaceae because of the presence of monothecate anthers, as opposed to the bithecate anthers common to the rest of the mallows.