
Courtney has the backing of the crown prince and is deemed to be his master. She can simply state "It is hereby of command that these four no longer carry the name of a noble. This house will now be renewed in another name with higher power." A simple statement, simple words from the queen herself is enough to re-write anything.
Once she marries him, she better throw them off the streets. Away from harm, but will teach themselves to live as a peasant.