I lived out of state for 8 years while serving in the military. My parents did not have a lot of money, but they would save up and buy me plane tix at least twice a year so we could visit....or they would fly down and see me.
If they wanted to see him, money wouldn't stand in the way. They may have been lower income, but probably still made it work to see their son. IMO.
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He just recently got out of medical school and residency. It takes a lot of money to become a doctor. If his family isn't well off, then he is likely in debt with student loans. Would make sense then for family to buy him a ticket. Sounds like his mother didn't like his ex, but perhaps she liked the new gf, KH. KH was beautiful and educated. What's not to like?