Then you needYes she is included as a dependent. No it’s my father as principal applicant and mother as a dependent on PA. I am sponsoring both.
One Form IMM 5406 filled by/as your father (PA) with all spouse, children, parents, sibling information in the form (your mom as spouse)
One Form IMM 5406 filled by/as your mother (dependent) with all spouse, children, parents, sibling information in the form (your dad as spouse)