Father of my kids girlfriend threatened to fight me

You should not be threatened by anyone, period, especially with a threat of physical violence.  Should you feel tha the threat is 'real' and imminent, that is, likely to occur very soon, you should seek an injunciton to protect you.  Florida law provides for an injunction in cases of dating violence, stalking, domestic violence and in other situations.  You may wish to file a police report as well just to place law enforcement on notice of the potential for violence by this woman.  Incidentally, since the father has left your household where you live with his other chilren, you may wish to consider filing an action for child support or, additionally, for paternity. If you are having financial difficulty, you may seek the services of the Child Support Enforcement Division of the Dade State Attorney's Office. They can assist you in establishing and collecting child support at no charge to you, particullary if you are curtently receiving any form of state assisatance (Medicaid, SNAP, etc.). Good luck to you and the children.