Justin and Shaney Barnthouse spent nearly seven years in their quest to adopt a child. But since November — when they brought siblings Sasha, Vika, Dima and Roslana back from the Ukraine — the couple has jumped off the deep end into parenting not just one child, but four. The Barnthouses first began considering adoption in 2005 after they discovered they could not have a child on their own. At first, Shaney and Justin wanted to adopt an infant, then began considering an older child. But after suffering several heartbreaking setbacks, they honed in on a group of four orphaned …