Obama Sr had children with three women, Ruth, Ann, and Kezia.
Obama Sr - Ruth had Mark and David
Obama Sr - Ann had Obama Jr
Obama Sr - Kezia had Auma
Obama Jr relates “of all of the Old Man’s kids, Mark’s claim is the only one that is uncontested”
Obama Jr here states that his claim is contested. So what is that on the White House website?
No. Obama merely quotes Auma as believing all other claims are contested. The person indicated by Auma as lacking documentation is Auma's mother.. Obama doesn't say one thing here about what HIS mother may have had or not had by way of documentation about Obama, or whether either Obama or Stanley Ann thought Obama's claim was contested.
You're reading into the text what isn't there.