What should be done if I would like to leave my house to my niece in trust for her children ages 4 – 15?

See a trust lawyer.

You need to first have detailed discussions with her and her children as to what they want and what their plans are. Do the children get along so that all of them could be joint owners or will their be problems? Do you want them to be able to transfer ownership to their future spouses or be able to sell the house. What will the tax consequences be? Will the house go up much in value. Will they have enough money to maintain the house? Who plans to live in the house, as they can not be evicted and do not have to pay rent, so those who plan to move away from the area or not live there may have to pay a portion of the taxes but have no benefit from the house. Are some of the children a bit lazy and knowing they will have a house to live in will make them less independent and willing to be successful on their own? What effect will it have on your niece and her husband? There are a lot of things you need to think about. Read some books on ?putting homes in a trust [see Nolo Press for a good lay person's description] and look at wed sites where legal questions are answered to see what issues may exist. Then go to a local trust attorney to get their advice. Children often fight among themselves and the good get taken advantage of by their more self-centered siblings.

You need a few things: a pour over will, a trust and a deed to put the property in the trust.