They are in the 1910 US Census in Clifton district, Alleghany county , Virginia.

Donal H. father age 50 (widowed) b. VA
Madge dau. age 24 Single b. VA
Henry Ed. son age 20 b. VA
William A. sone age 19 b. VA
Mary J. dau. age 16 b. VA
Ida M. grand-dau. age 9 b. VA
Thomas "?" grand-son age 6 b. VA
Dallin dau. age 5 b. VA
Gregory, Howard - boarder- age 19 b. VA

Looks like Donald is Ida's grandfather. Since her mother Madge still had her maiden name, maybe she was never married. This makes it rough. I suggest you see if VA and that county had Bastardty Bonds. This is where a woman had a child out of wedlock, they had to put up a bond to help support the child if they were not able to do so. In this bond, either they put up money or they named the biological father.

Good luck.