My question is about a real estate sale in: Washington State

My ex girlfriend (meretricious relationship) and I bought a home together a few years back. Her parents "gifted" her $50,000 for the down payment. The gift document says it is being gifted to her as a down payment and then I am also shown and signed on the document. All four of us are on the title to the home.

They claim that the home has negative equity because they should get back all of their $50,000 - then the home's value is calculated.

My question is this: If the home is sold, can her parents or she LEGALLY reclaim the gifted portion before proceeds are divided, or am I due 25% of the remaining balance after the mortgage is paid regardless of any gifted $$?