Finding family of Louie and Gertrude Grow

I am trying to find the daughters of Louie and Gertrude Grow.I think they were married in Michigan but do not know the date.They had two daughters Betty Lou who would be about 64yrs old and Shirley who would be about 67 yrs old.The last we heard about them they had moved to Salem,
Oregon.My mother (Elsie Wright (Barth) is their aunt and she would like to make contact with them.