Anniversary question

My father-in-law passed away in early March of this year. So we're trying to spend more time with my mother-in-law. She needs more company since my father-in-law passed away. It was their anniversary the other day of course she was very upset but she was also upset that none of her kids called on that day. Of course we thought of their anniversary. We'd never forget, but what were we to say if we called her on that day?