How to handle mothers/fathers day after my sister's death?

I'm 26, my younger sister (23) overdosed and died about 6 months ago. It's been very traumatic for the whole family obviously.
I'm someone who has a hard time being sentimental or emotional in general, especially with my parents. And this will be the first mothers day and fathers day since her passing and I am DREADING it honestly.
How to handle mothers/fathers day after my sister's death?
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