The siblings, seventh-generation members of the Wallenda family circus troupe, have trained for the worst possible conditions. They've used wind machines with 90 mph winds and hoses blasting water to simulate torrential rain.

\"I've done some big events in short periods of time, but nothing compares to this,\" Nik Wallenda said.

Two years since the tragic accident, Lijana Wallenda will have to confront her nerves before the physical and psychological challenge.

\"I'm just a little nervous because the wire moves more than anything I've ever been on,\" she explained.

\"PHOTO:
ABC News
PHOTO: Acrobat siblings Nik and Lijana Wallenda prepare to attempt a highwire stunt in the middle of Times Square in New York City.
>

\"There is that physical aspect that she hasn’t been on the wire for a long time, so that’s a major concern,\" her brother said. As for the mental aspect, \"I have concerns that when she gets up here I don’t know that she’ll take that first step. I think she will, our family blood says never give up, continue on,\" he said.

\"What she’s having to overcome to me, is almost impossible, and I’ve done this my whole life as well,\" he said. \"This is the highest walk by double anything she’s ever attempted before and the longest by quadruple.\"

\"PHOTO:
ABC News
PHOTO: Nik and Lijana Wallenda will perform a highwire walk between two famed New York City buildings in Times Square on June 23, 2019.
>

\"Highwire Live in Times Square with Nik Wallenda\" will air live on Sunday, June 23, from 8 p.m. to 10 p.m. ET on ABC.

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