A relative passes away on 14 Adar (II) 5776. Is the final Kaddish said at Mincha on 13 Shvat or Mincha of 14 Shvat?
You specifically should stop saying kaddish at mincha of the 13th of shvat. If you continue longer it is already entering the 12th month and we don’t this unless the person was a rasha R”L.
Be’er Hetiv O:CH 132-5, Pnei Boruch 34-1.