There’s nothing wrong in acknowledging your mother. While growing up post Holocaust years, here in America we always made Mother’s Day Cards in Bais Yakov and in our family some of us still continue with the cards. No my children don’t send me any cards but that is the new generation for most part and it would make me feel good if i were to get a card or a call wishing me Happy Mother’s Day as i will to them. For those who say it’s a issur m’doraisa, could you let us know the exact words and where it is written? And to all you mother’s out there HAPPY MOTHER’S DAY today and every day of the year, with gezunt,parnassah and nachas till 120 years!!!!