I ve a reltive in amereica who own a house, and a family member took a remorgage on the property, and took..?

the money from the bank on the basis that they an pay half the morgage payments for 3ys and the rest will be added on, now the 3ys is up, the morgage payment s has fell into arrears, my aunt who is in her seventies, is going to end up living on the street, she s too old to work, she thinks she only owes motage but it is the loan he took out to set up a bussiness, and she is not aware of how serious it is. she is going to loose her home through a selfish son who has not paid anything. wot can we do or advise me PLEASE HELP. i am on the otherside of the country. she has lived in that house for over 30ys.