Ephesians 6: 2-3 Amplified
“Honor [esteem, value as precious] your father and your mother[and be respectful to them]—this is the first commandment with a promise so that it may be well with you, and that you may have a long life on the earth.”

Whether your mom is alive or not the best way to honor her is to speak well of her to live a life that would honor her and God.