In Joe´s words.
[youtube]http://www.youtube.com/watch?v=eNu3QGprTlw[/youtube]
If Michael´s father said it but Michael didn´t I guess that we could imagine that Omer is Jackson but I also think that Michael would have talked openly about it.
And yes, I think that matters if Omer is Michael´s son or not. Michael has a Kingdom to be the heritage of his children, legally talking.
If Omer does not care, we should not either /toldya/