Hi Sonia
I can only provide a lookup for 1870 and 1900 censuses,and the Freedmen's Bank Records. I did not locate Andrew in the 1870 census nor the Freedmen's Bank Records, but I did find him in 1900. Helland's birth month was December.
Since you have the names of their Children, you should check the 1910 census (at least for the male children (i.e. Edward, Alonzo and the others). Perhaps they are married and as such, they would be listed with their families.
Sorry I couldn't be of more help.