Many fans have written in about the real relationship between "cousins" Casey and Will. Well, the Hughes family tree, which branches off into the Munsons, Ryans and Montgomerys in more than one place, has a rather complex growth pattern that we've tried to simplify here. Regarding Casey and Will, as you can see, they are quasi-cousins because Casey's grandfather Bob was once married to Will's grandmother Jennifer, and is currently wed to Will's great aunt Kim. Therefore, they share an aunt (Frannie) and also a half brother (Adam), because Casey's mother (Margo) and Will's father (Hal) once had a fling. We won't even get into the fact that Casey's father (Tom) and Will's mother (Barbara) were once engaged. Confused? Try using this to visualize:

Chris (deceased) and Nancy Hughes				Click to Zoom
child(ren):	Susan (deceased)
	Penny
	m. Jeff Baker (deceased)
	m. Neil Wade (deceased)
	m. Roy McGuire
	m. Anton Cunningham
	child(ren):	Amy Lin (adopted)
	Don
	m. Janice Whipple (deceased)
	m. Joyce Colman
	m. Mary Ellison
	child(ren):	Teddy, a.k.a. Ryder (Mary's adopted son with Brian Ellison)
		Christina
	Bob			Click to Zoom
	m. Lisa Miller
	child(ren):	Tom
		m. Carol Deming
		m. Natalie Bannon
		m. Margo Montgomery
		child(ren):	Lien (from an affair in Vietnam)
			Adam (stepson; parents are Margo and Hal)
			Casey (with Margo)
			child(ren):	Baby Boy Norbeck (with Gwen Norbeck; deceased)
			Daniel Hughes (with Emily Stewart)
	m. Sandy McGuire
	m. Jennifer Sullivan Ryan
	child(ren):	Frannie
		m. Darryl Crawford
		child(ren):	Carrie (adopted)
		Melinda Gray (Jennifer's daughter; deceased)
		Rick Ryan (Jennifer's son)
Click to Zoom		Barbara Ryan (Jennifer's daughter; Kim's niece)
		m. James Stenbeck
		child(ren):	Paul Ryan
			m. Rosanna Cabot
		m. Gunnar St. Clare (presumed dead)
		child(ren):	Dusty Donovan (Gunnar's son with Nicole Donovan)
		m. Hal Munson
		child(ren):	Nikki Munson (Hal's daughter with Lynda Graves)
			Jennifer Munson (with Darryl Crawford; raised by Hal)
Click to Zoom			m. Mike Kasnoff
			child(ren):	Baby Boy Kasnoff, a.k.a. Rory Cabot/Billy Norbeck (with Craig)
			Will Munson
			Parker Munson (stepson; parents are Hal and Carly)
		m. John Dixon
		child(ren):	Margo Hughes (John's daughter with Lyla Peretti)
			Andy Dixon (John's son with Kim)
			Ian "Duke" Kramer (John's son with Rosemary Kramer)
			M.J. Dixon (John's son with Iva Snyder)
			John Dixon, Jr. (deceased)
		m. Craig Montgomery
		child(ren):	Bryant Montgomery (deceased; Craig's son with Sierra)
			Lucy Montgomery (Craig's daughter with Sierra)
	m. Miranda Marlowe
	m. Kim Sullivan Reynolds Dixon Stewart Andropolous
	child(ren):	Sabrina
		Christopher
		Andy Dixon (Kim's son with John)
		m. Courtney Baxter
		m. Denise Maynard
		child(ren):	Hope