Canadian individual tourist visa application for mother and child together

A 21-year-old child is still in school or already working. If he is not employed, he can apply with his parents. The source of funds and guarantees are all on the parents' side. Depending on the mother's conditions, he should be able to pass. If he is already working , the child must provide materials such as salary and a leave approval letter from the company. In theory, these materials should be processed separately from the mother's materials