Mothers and Daughters Behind the Women's March on Washington

As thousands of women gather for the Women's March on Washington, some of the organizers of the movement speak out on "GMA."
4:04 | 01/17/17

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Transcript for Mothers and Daughters Behind the Women's March on Washington
That's a live look at the capitol. Just three days from the inauguration of Donald Trump. Many, many, many will be there and many women are also focused on the next day, Saturday, when hundreds of thousands are expected to March on Washington. The movement, I don't know if you realized it was started about I a grandmother and ABC's Mary Bruce is back with that story back in D.C. For us. Good morning, Mary. Reporter: Good morning, robin. That's right, Friday is the big day here in D.C., but so is Saturday. Lots of families expected to be out for the inauguration but the day after hundreds of thousands are expected to gather right here to voice their concerns on the first day of the new trump administration. It's a protest that started with women but has come to encompass many causes, growing so large that the grandmother who started it all tells us she's flabbergasted. I March for her and him. We March because your generation will build a wall and our generation will knock it down. Reporter: It could be one of the largest demonstrations ever in the nation's capital. The women's March on Washington. When it comes time to act, I want my children to know that I showed up. Reporter: Hundreds of thousands, mothers and daughters from around the country are headed to D.C., turning their election night concerns into a positive movement. But what you might not know is this female driven March was sparked about I a single Facebook post the day after the election. I wanted to do something. I wanted to take action. Reporter: Disappointed by thump's win on election night 60-year-old grandmother Teresa shook from Hawaii took to Facebook in hopes of becoming a small voice for women's rights and with her four granddaughters in mind she wrote five simple words. I wrote, I think we should March. Reporter: Within a few hours 40 women had replied agreeing and by the next day, 10,000 women were in. Helping fan those flames the four co-chairs of the women's March organization that have been working nonstop since election day to turn that Facebook post into reality. But the scope of the March is now so much bigger than election night angst. With many groups coming to voice their concerns about the incoming trump administration. One of our goals for this March is to display what it looks like when the Progressive movements are working together when you have climate justice, racial justice, immigrant right, women' women's reproductive rights. Reporter: Organizers say it's also about families as everyday mothers and daughters work together for a common goal. In we also want the world to know that women are leaders and that we want to show our children especially our daughters that they can be the next generation of leaders, ras well. Reporter: Nikki powers from ft. Collins, Colorado, is making her way to D.C. With a group of co-workers and along for the ride is 14-year-old MARIA Peeden. I'm excited to connect with thousands of women who feel the same way as I do. Reporter: But it doesn't end in Washington. Over 270 sister marches will be happening simultaneously in all 50 states and in 33 countries around the globe. But for the grandmother who started it all, she says she's already bought her ticket to D.C. One person can make a difference. Reporter: Now she tells us she hopes her story can remind people that with just a few words one person can make a real difference. Now, Donald Trump has promised to unite the country vowing to find common ground and bring people together. And critics say it's simply too soon to be holding a protest the first day after the inauguration. But, guys, those organizers tell us they say it's never too soon to speak up for a more just and free America. They want to make sure their voices are heard and we've heard from so many who have said that -- illustrated in your piece bringing their daughters and going to be there and be a part of this. She agrees. I believe she does. Thank you, Mary. Coming up here, she was one

This transcript has been automatically generated and may not be 100% accurate.

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