Do you have a birth/death date for your Pierre Godin dit Tourangeaux? My great grandfather Peter Godin's father and grandfather Godin/Gaudin were both Pierres. I'm not sure when the dit name was dropped. As I recall these Torangeaus in Cahokia were from the same family also located in Carondelet, MO. across the river from Cahokia. You might delve there.