Immigration Site

hi friends,
i have received two packets(one each for my parents) from NVC containing forms I-864 in each packets.
do i have to fill out both I-864 saperately for my father and mother (they both have saperate case numbers)
when i fill out I-864 for my father do i have to write my mothers name in the table of part-3 ?
when i fill out I-864 for my mother do i have to write my fathers name in the table of part-3 ?