Just to clarify, Terri's friend said TH cared for Kyon since he was 3 days old, but that's very misleading. Terri might have been "involved" with him because she was Desiree's friend, but Terri did not become full time stepmom to Kyron until he was a toddler. Terri moved in with Kaine when Kyron was a toddler.
Article where friend references
http://www.nwcn.com/news/oregon/Friend-defends-Kyron-Hormans-stepmom-96798439.html
The now-infamous "Blended Family" article:
http://www.oregonlive.com/portland/index.ssf/2010/06/kyron_hormans_blended_family_f.html
From the Blended Family article that explains how and when Terri moved in with Kaine and Kyron:
"The story dates to 2000, when Desiree married Kaine Horman. The couple's relationship quickly soured, however, and they planned to separate, but then Desiree got pregnant. So, they gave it another shot. But in August 2002, when Desiree was eight months pregnant, she filed for divorce, citing irreconcilable differences.
Kyron was born Sept. 9, 2002, and Kaine and Desiree were officially divorced in 2003. Kaine and Desiree shared custody, but Kyron mostly lived with Desiree until 2004, when she went to Canada after suffering kidney failure.
Kyron moved in full time with his dad, now 36, an engineer at Intel. With a demanding job at the company's Jones Farm campus in Hillsboro, where he works in the architecture group, Kaine needed child care. So, Desiree's friend Terri moved in to help. "
A small detail, but I think it's important to know that while Terri was "involved" in Kyron's life as a newborn through her friendship with Desiree, Desiree was his full time mom until 2004 - a full two years after Kyron was born.