My father, my mother and my brother applied for immigration to Canada together.

Look at the question you are asking now, it is difficult to answer whether your application is successful or not. Generally, if you apply for investment immigration, you can apply for immigration for the whole family. However, if the applicant is a skilled immigrant, it will be difficult for adult children to apply in the past, but there are exceptions. At present, you provide very little information, so it is difficult to give you advice.