One of my ex helper who existing employer relocated so she found a job with the neighbors, she stayed with them and worked in the new house while her new visa was being processed, due to the new employers forgetting some documents and being out of town, her new visa was delayed, she had to go to immigration 2 times for her own visa extensions, immigration dept knew she was staying in the new employers house and anyone can figure out that she is already working there but they didnt bat an eyelid.