So when are we getting the9-1-1musical episode?

SIERRA McCLAIN:This has been sitting with Grace for two years, festering.

That felt like a very relatable story to me.

Sierra McClain and William Allen Young on ‘9-1-1: Lone Star’

Sierra McClain and William Allen Young on ‘9-1-1: Lone Star’.Scott Everett White/FOX

I would just shut down when it came to conflict.

And I can say firsthand that doing that does not yield great results.

It yields exactly what it yielded for Grace.

Lauryn McClain, China McClain, Jim Parrack, Barbara Harris, and Sierra McClain on ‘9-1-1: Lone Star’

Lauryn McClain, China McClain, Jim Parrack, Barbara Harris, and Sierra McClain on ‘9-1-1: Lone Star’.Scott Everett White/FOX

Ultimately, I loved his position because that’s the position that somebody like Judd is supposed to take.

Actually didn’t even read whatever the [script] pages were supposed to be for that day.

In that moment, all of Grace’s training flies out the window.

And so I wanted that all to feel very real.

How was working with your sisters?

It was a very emotional experience recording “Smile” in the studio.

It was just special.

This is not something my sisters and I have gotten to do in a long time with each other.

What can you tease is coming up for Grace?

We’re approaching the end of the season, but there’s a lot packed in there.

Grace is going to get up from her desk and out in the field a little bit.

I can’t wait for people to see that.

I’ve been waiting for Grace to really be a part of the action for years.

And you’ll see Grace and Judd in some situations that’ll be tough.

This interview has been edited and condensed for length and clarity.

9-1-1: Lone Starairs Tuesdays at 8 p.m. ET/PT on Fox.