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					Originally posted by HEARTCORE  So according to this theory, Mary's children were CeCe/Charlotte/Charles, AD and Spencer. And Jessica's children were Alison and Jason. So Spencer and Alison are not half-siblings, but instead they're cousins? This theory makes sense but it's very messy, which is probably why it's true   | 
	
 That's right. Would actually explain why Jessica was always so anti-Spencer and even told Alison that she has "plenty of reasons to hate you" or something like that.
If Peter was Mary's "ex-lover" it'd make sense she brought it up in the convo w Spencer. That, of course, would mean Peter screwed both of the twins and this dude has children with 3 women 

 Would explain why Peter was so eager to shut down Radley. Since twins share the same DNA it makes Spencer and Jason 100% brother and sister. 
 
Mary: Charlotte with TBA, Spencer and AD with Peter
Jessica: Jason with Peter, Alison with Kenneth