What would happen if we restricted voting rights to only allow biological parents to vote in elections?

Scenario: ALL childless people, including adoptive and foster parents that do not have any biologial children of their own (sadly, this includes almost all homosexuals - bar Rosie O'Donnell and Elton John).

Things will go in a better direction
Things will go in a worse direction
Select gender and age to cast your vote:
What would happen if we restricted voting rights to only allow biological parents to vote in elections?
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