Can subpoena be removed by the party who requested it when we get to court?

[Mrs. St. James]

I posted about subpoena that had to do with my mom stepdad and brother.. however, can it be removed? my stepfathers lawyer is the one who requested the subpoena so if i go to court tomorrow and ask him, can he remove the order so i wont have to testify?
I was already called in to go tomorrow.. i was just wondering, when i get there, if i was able to talk him into it- could he remove that order before i was called up to testify?