That is correct.(IMM5476 may or not apply. It's only needed if you want someone to represent your case). Dont forget IMM5771e(Checklist)Following are the forms that I am filling. Please let me know if my understanding is correct.
Sponsor
IMM1344
IMM5768
Principal applicant (Father)
IMM5669 - Father
IMM5669 - Mother
IMM0008enu_2d - My father has only one dependent (my mother) and therefore I dont need to fill additional dependent form.
IMM5406 - Father
IMM5406 - Mother
IMM5476