BTW: your siblings have the opportunity to immigrate through an economic immigration stream like Express Entry. This is what they should focus on.
If you are sponsoring your parents, that sibling would be included as a dependent in the parent sponsorship application. As long as they are single and under 22, they are included as a dependent along with the parents.
Yes, your sibling is a dependent of your parents and must be included in the LICO calculation. You need to have enough income to cover yourself, both of your parents, any dependent siblings - and of course your spouse (if applicable) and children (if applicable).
You can't do that. It doesn't work that way. You need to have enough income to cover both parents and your dependent sibling (and of course yourself). Also, both of your parents have to take and pass the medical and also provide police certificates, even if one of them doesn't want to come.
