It was an unimaginable tragedy — the loss of her son, daughter-in-law and 4-month-old grandson in an April 13, 2021, car crash in Missouri — that pushed Cecilia Williams into advocacy. A month after visiting the crash site marker on a Missouri state highway, Williams recalled, she knew she had to channel her grief into strength for her two surviving grandsons, Bentley and Mason — and for others affected by reckless, fatal crashes. Working with other advocates, she helped write legislation called “Bentley and Mason’s Law” — often shortened to Bentley’s Law — that would require convicted drunken…