Hi im in a 15 year relationship and suspect infidelity can i legally write the other women a letter to get clarification

Not a wise move. Unless you are in a custody battle infidelity frankly has little bearing on the case.

How do I obtain custody back of my children from the grandparents who have a Temporary custody order?

You have to file a motion for reunification, you should win no problem as grandparents have no rights.

How can I get a copy of my marriage license?

call the clerk.

Is there laws in state of florida aginst a partner in a marriage having a boyfreind move in with them during a seperation

There is no law per se however it is not appropriate to move in the boyfriend before finalizing the divorce, in my opinion.

Any attorneys in Hillsborough County that'll take a case for a military wife and sue for the husband pay legal fees?

Most lawyers will not do the case for no money down. Try to locate counsel who will do a payment plan and go after the other side for fees.

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My sisters ex husband has sole custody of my nephew in IL, they had an arrangment for visits but now he is refusing.

FL does not have jurisdiction over the case

Do I have a chance with this lawsuit

You have no case for mental anguish.

File a petition for injunction also contact the police.

I was paying child support for a child that isn't mines. I got proof thru a self paid DNA test. However could I file suit

You can file a petition to dis-establish paternity against the mother, you have no case against CSE.

I've been living with my fiance for 3yrs, He has supported me financially not allowing me to work but to stay at home.

You are not married so you cannot get alimony, he does have to pay child support, since not married you can relocate anytime if there are no court...