If they are adults, you will need to get them to sign quitclaim deeds that return the rights to the property to you. Or you can purchase their share of the property from them.
If they are on a deed as a co-owner, you'll have to have them sign their portion of the house back to you. Or a partition action in court. I would consult with a real estate attorney to look at your options. You cannot sign them off unilaterally.
Get their signatures on a new deed. And, I'm sorry but for others reading this I have to say it is almost never a good idea to "put the kids' names on property." What you are doing is giving away your property.
You have to create a new deed and have everyone on the deed sign to transfer it to the new owners (you). If they refuse, you end up with some unintended consequences for your prior choices.
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