[xbubba007]

Live in forida.
Niece has lived with us for 18 years.
Niece is 21 and has a 3 year daughter.
She is dis-respectful, and at time full of rage.
I feel she may try to harm my wife.

How can I get a niece with a child out of my house?

{removed}

[J_9]

Have her formally evicted.

[Fr_Chuck]

First where is this, in some Asian nations you just throw her out, in the US or Canada you will have to give her a formal notice to move, and if she does not have her evicted though the courts.

[ScottGem]

Does she pay rent? Was there an agreement to pay rent?

If so, and she doesn't you can give her a 3-day pay or quit notice. Otherwise you give her a 15 day notice to vacate. If she doesn't then you go to court for an eviction order.

That she is a relative does not matter so I've moved your question from Family Law.

[J_9]

First where is this,

Florida