my brother is a USC. he is deaf and mute. he is married with no kid since 2016, his wife is also deaf and mute. he now has 2 jobs and is planning to petition her. she is from the philipines. he has been visiting her every 2- 3yrs and they always talk in fb messenger. i wanted to help him to start this process. as i was looking for the evidence to submit, they dont have any property or banks on both their names. is there any other proof that there marriage is bonafide? his passports have stamps of all the dates he visited her, pictures together, marriage certificate, he sends her money via xoom. i was thinking maybe my mom can write an affidavit? i just want to be prepared before starting the i 130 because 535$ filing is a lot of money for him for it to be denied
thank you for your input