Lisa Alfaro Munday vs. William Mark Munday

In this post-divorce proceeding, the trial court designated William Mark Munday ("Father") as the primary residential custodian of two of the parties' children. He had been awarded primary residential custody of the parties' third child at an earlier time. Lisa Alfaro Munday ("Mother") appeals, arguing (1) that the trial court lacked subject matter jurisdiction to modify the custodial arrangement and (2) that there had not been a material change of circumstances to warrant a change in custody. We affirm.