takahmamash
Whats more important is that you say Kaddish actually. Focus on the fact that you are doing something special for your parents every time you say kaddish. Its a small token of appreciation for all they have given you in your life. Make sure that when you say kaddish you have kavannah and focus on the meaning because for some people it would be a bigger thing for their parents if they didnt say kaddish…I wish you only simcha from this time forward and pray that Hashem give you the strength to overcome such a challenge.