He has to show where the money came from so if sister dumped funds into his account one month, then that is a red flag. He has to match his funds with salary. He is not your dependant and has a family so needs to show his own funds. If you are supporting him then his profile weakens because IRCC will not think that he can support his own visit.he have his 6 bank statement where there's a salary credit
he also have opened a new bank account and sister helped him with lil cash for funds , is it a problem ?
or i can just tell in the letter that im taking care of all his expenses ?