( CNN ) -- A French family is planning to sail home from the United States on the Queen Mary 2 after British Airways declined to honor their return tickets , according to CNN affiliate WBBM . The Chenais family was supposed to fly home to France a week ago . The family has been in the United States seeking medical treatment for their 22-year-old son Kevin 's hormone disorder , the family told WBBM . Kevin Chenais weighs 500 pounds . `` The British Airways team worked tirelessly to try and find a solution for the family but unfortunately we can not safely accommodate the customer on any of our aircraft , '' British Airways said in a statement . `` We were in regular contact with the family to discuss other options and we provided hotel accommodation throughout , '' the airline said . The customer service team `` exhausted all options . We 'll always try to accommodate a customer if it 's at all possible and it 's safe to do so . '' The airline offered the family a full refund . Read more : How to cope with shrinking airline seats . Kevin Chenais requires oxygen and regular medical attention , WBBM reported . Kevin 's mother , Christina Chenais , told WBBM she does n't understand why the airline wo n't take Kevin home . `` If they could bring him here with that problem in economy , there is a way to take him back by economy , '' she said . `` But just get him back home for his medical treatments to continue . '' Generally , the airline would offer larger passengers the option to purchase another seat , an airline spokesman told CNN . British Airways would not comment on the specifics of the Chenais ' case , citing privacy concerns . The Chenais family plans to take the train to New York , WBBM reported , where they will board the Queen Mary 2 .
Man was in the U.S. seeking medical treatment , CNN affiliate reports . The man is a Canadian citizen who has been living and working legally for years in New York City.