atory . ▁Peter ▁once ▁again ▁wrote ▁to ▁his ▁son , ▁who ▁had ▁not ▁answered ▁his ▁parents ' ▁phone ▁calls ▁in ▁weeks : ▁" I ▁want ▁you ▁to ▁know ▁that ▁if ▁you ▁ab use ▁my ▁credit ▁again , ▁I ▁will ▁be ▁forced ▁to ▁file ▁forg ery ▁aff id av its ▁in ▁order ▁to ▁disc laim ▁li ability ▁and ▁that ▁applies ▁to ▁the ▁Cit ib ank ▁college ▁loan ▁if ▁you ▁attempt ▁to ▁react iv ate ▁it ▁or ▁use ▁my ▁credit ▁to ▁obtain ▁any ▁other ▁loan ." ▁ ▁The ▁email ▁concluded : ▁" We ▁may ▁be ▁disappoint ed ▁with ▁you , ▁but ▁your ▁mother ▁and ▁I ▁still ▁love ▁you ▁and ▁care ▁about ▁your ▁future ." ▁ ▁John athan ▁Por co ▁Por co ' s ▁brother , ▁John athan , ▁test ified ▁at ▁his ▁trial . ▁According ▁to ▁the ▁Alb any ▁Times ▁Union , ▁John athan ' s ▁testim ony ▁influenced ▁the ▁j ury ; ▁his ▁de mean or ▁toward ▁his ▁brother ▁was ▁" icy ", ▁and ▁he ▁described ▁their ▁relationship ▁as ▁" stra ined ". ▁ ▁Por co ' s ▁character ▁Police ▁cont ended ▁that ▁Christopher ▁Por co ' s ▁behavior ▁was ▁consistent ▁with ▁a ▁diagn osis ▁of ▁psych op ath y ▁or ▁soci op ath y , ▁two ▁similar ▁though ▁not ▁identical ▁dis orders ▁character ized ▁by ▁path ological ▁de ception , ▁sc am ming ▁and ▁def ra ud ing ▁others , ▁and ▁lack ▁of ▁conscience ▁or ▁rem or se . ▁For ▁example , ▁Por co ▁li ed ▁to ▁obtain ▁both ▁a ▁car ▁and ▁tu