It would close this particular loophole, by treating legally disowned and merely estranged identically. I'm not saying they would accept letters stating that y

It would close this particular loophole, by treating legally disowned and merely estranged identically. I'm not saying they would accept letters stating that you are estranged (which they certainly don't do now). I'm saying they could refuse to believe recent legal changes to parenthood, and just demand the whole list since birth. Just as lots of documents need every name you've ever had, not just your current legal name. (Whether the actually estranged should be treated differently is another question. Judging by how they've run the system so far, the colleges don't seem inclined to do so. I don't mean to defend their behavior, only to ask what moves they may make.)