Babysitting my neice and she walked for the first time, do I keep it to myself?

She's been cruising tables for a few weeks and walking holding on to people's hands a little bit. Today she was hanging out with me holding on to the coffee table, saw my dog come inside, let go of the table and took a couple of steps towards her! She did it a few more times before falling over. A couple of hours later, she definitely walk walked at least five steps. This time I was ready with my camera, so I do have video.

Husband thinks that we should tell, I think that we take it to our graves, unless they ask us, then we'll show them the video. This is her Mom's first time leaving her overnight and she was really anxious about it, I think she'll be really upset she missed it. Husband says if he was them he'd rather get to see her exact first steps, I said that the exact "first" doesn't matter, they'll still see one of the first times she walks and think it's her first. It's not like she's gonna be running a marathon by tomorrow morning.

Thoughts?