Thank you very much for the message.
After I had posted mine, I was searching on Fold3 and looked through every death certificate for Evans in Montague County. Found the one for Mollie. Almost all census records listed her as Mollie H. Evans, but apparently her full name was Mary Nancy Miles Evans.
William died bet. 1/1920 and 4/1930, but without his death reocrd, no way of knowing, unless he has a tombstone. some of his family members do not have regular stones, only funeral home markers, so will have to see.
Thank you again.