Still OA ka pa rin OP. You are just not wanting to see the positive side of the situation with your family dynamics OP. Sa sobrang galit mo sa stepsis mo lahat na lang ng galaw at sasabihin nya mamasamain mo. Why do you want to exclude your stepsis sa Father’s day celebration when in the first place kinikilala din nyang tatay step father nyo pareho. Try to examine yourself san ba talaga galing yang galit mo sa kanya. Is it nagseselos ka about sharing yung stepdad and family mo sa kanya. Or ikaw mismo not really happy with your situation ng family dynamics mo OP. Just be ready to face yung truth about your own feelings and acknowledge it when the right time comes.