False accusations

I have been falsely accused of sexual misconduct with a minor. The little sister of an ex girlfriend of mine brought forth allegations of misconduct after me and my ex had a bad split. This all started when I stopped paying her way and wanted to get away from her. She did nothing but use me for money and guilt me into helping because we share a child together. She made many accusations against me anytime I refuse to give her money but when I would give her money everything was fine. No allegations from her little sister ever came up until my ex lost her apartment because I wouldn't bail her out after she squandered her money and moved back in with her mom. My ex manipulated her little sister into trying to destroy my life as well as pushing allegations of her own. I have proof via statements from sources that have heard the family say I was never alone with the child to do these allegations. There are no witnesses of these allegations. I've been suspended from work and I could lose my children. Which is exactly what my ex is trying to do. My children already lost their mother in May of 2017 in a car accident. Their grandmother has been fighting me for custody for over a year now and my ex is working with her trying to help her take my children. I've got a legal defense going but since I've been suspended from work I'm unable to make money for my defense. I have taken loans from friends and family and sold off anything of value I can. I am a hard-working father. I work 60 hours a week to care for my children and my disabled father. I've had a clean criminal background and I'm a lawful carrier of a license to possess a firearm. I worked in a security field with Brinks Inc where I'm trusted to transport and deliver money. I am an honest and trustworthy person. My legal fees are making it difficult to take care of my family. Any help will be greatly appreciated.