[@BrokenWashing] Well at one point Swamp Thing was married to Abigail Arcane, niece of his archenemy Antone Arcane, and future Avatar of the Rot. Tefe Holland's conception is rather complicated but suffice to say, she is a plant-human hybrid who is also the biological daughter of John Constantine. The DC wiki has more in-depth info on that. 

Sheet is looking good. It's an aesthetic thing but you can alter the color of the headlines if you wish.