That's a power move from Granny right there. Deport foreign garbage and keep the japanese one, because he reminds me of my husband. Granny is an odd one with a good heart, but way too obsessed with Kaiji.
That said the trio is way too relaxed about it all and telling her they dont got any money at all was really dumb. Like you live in a big house while not working, so least tell her you inherited it and some savings that last for like a year.