It's not an expensive undertaking to fly back to Hungary.Saving up to buy property could be a very reasonable way to fend off pressure to travel home more frequently. Purely speculative, of course.
IIRC: It was reported that they went back home 2x.
Parents are known to fly their kids back home for visits.
It could be that the parents could never afford to do that?
I doubt we may never know much more,if anything, then what we know now about the sisters and their family.
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