You accused people of giving wrong advice. "speak on grounds not imagination". You then make a direct accusation to the person trying to help you "Because of you people get disappointed and take wrong steps"
I or any other person would consider this an insult.
1) Counties do share information. This has been proven by other members here.
2) By lying on the application, your cousin is committing misrepresentation. This has a strict 5 year ban. Your cousin can be deported at anytime. If any of us can find your cousin's name, we could be in a position to report him to IRCC.
If you want people to say that what you are doing is alright. Then I am sorry, you are not going to find such people here. Such behaviour only makes it harder for those going through the proper procedures.
If you have a rejection then declare it, you are welcome to ignore our advice if you want to proceed with misrepresentation.