My grandfather was born in 1904, his son (my father) was born in 1941, I was born in 1979, my son in 2020. Great-grandparents have been out of the picture for

My grandfather was born in 1904, his son (my father) was born in 1941, I was born in 1979, my son in 2020. Great-grandparents have been out of the picture for awhile on my side of the family.