How do I get out of a mortgage that I am on with my parents?

You can't. Your parents will need to refinance without you.

Thanks for your reply ScottGem. Do you know anything about novation for mortgages in the uk?

Novation means substituing one party in a contract for another. If all parties including the mortgage lender agree you may be able to have someone take over your interest in the mortgage.

This may be more common in the UK, but its rare in the US.

Thanks very much for your help!
Kive