imm0008 is for applicant not for sponsor,.OK here you only include persons who are coming to Canada. If you have kids already but sponsoring 1 person ,just that one
But if children are coming to Canada they MUST be included say ; wife coming with 2 kids then here total will be =3, as a sponsor DO NOT Include yourself, this Q is for applicant abroad not for sponsor who is in Canada. Hope it is all clear now.