Shoul I walk in my Panties?

I am going to my sisters house 4 the weekend. I do not own pj's since i often sleep in my panties. I also always have to get u to pee at night it seeems. i told my sistert his and she said it was fine. she didn't care. however, she did tell me that her kids also get up at night to pee (an 8, 9, & 11 yr. old boys). she doesn't care if her kids see me in my undies, but in not sure if I should or not?