Help my nieces stay safe

Recently it has came to light that my 13 and 14 yo nieces have been sexually abused for a period of time by their mother's boyfriend.  They are both currently with their father now, but he has custody of only one.  In order to gain custody of the other, he needs $3000 to retain a lawyer, and it may cost up to $5000 before all is said and done.  With this being such a drastic situation, we are doing anything we can to get the money as quickly as possible to ensure she is not sent back to her mother's home where she is not safe.  There is an investigation open, and an order of protection has been issued against the man that did this.  Please, any little bit helps.  He's desperate to do what he can to protect his daughters.  We all are.  Thank you in advance.  It means more than you could ever know.