▁on ▁raising ▁the ▁baby . ▁However , ▁M andy ▁dec ides ▁to ▁begin ▁a ▁serious ▁relationship ▁with ▁Lip ▁in ▁order ▁for ▁K atie ▁to ▁have ▁both ▁her ▁parents ▁in ▁her ▁life , ▁so ▁she ▁moves ▁in ▁with ▁the ▁Gall agh ers , ▁to ▁the ▁disappoint ment ▁of ▁P addy ▁and ▁M imi . ▁M andy ▁later ▁reve als ▁that ▁she ▁named ▁K atie ▁after ▁M imi , ▁with ▁her ▁first ▁name ▁actually ▁being ▁K atherine . ▁Lip ▁eventually ▁moves ▁to ▁Not ting ham ▁in ▁order ▁to ▁go ▁to ▁university , ▁leaving ▁M andy ▁and ▁K atie ▁with ▁the ▁other ▁Gall agh ers . ▁After ▁Lip ' s ▁father , ▁Frank ▁Gall ag her ▁( David ▁Th rel fall ), ▁leaves ▁ec st asy ▁p ills ▁lying ▁around , ▁M andy ▁is ▁ter r ified ▁that ▁K atie ▁has ▁sw allowed ▁some , ▁however ▁this ▁turns ▁out ▁to ▁be ▁a ▁false ▁alarm . ▁ ▁In ▁Series ▁ 6 , ▁M andy ▁later ▁begins ▁a ▁relationship ▁with ▁Joe ▁P rit ch ard ▁( Ben ▁Batt ), ▁who ▁begins ▁to ▁ment ally ▁ab use ▁M andy ▁before ▁starting ▁to ▁beat ▁her . ▁When ▁this ▁is ▁revealed , ▁M andy ' s ▁older ▁brother ▁Jam ie ▁Mag u ire ▁( A aron ▁McC us ker ) ▁brut ally ▁attacks ▁Joe , ▁with ▁M imi ▁conf ess ing ▁to ▁the ▁attack ▁in ▁order ▁for ▁Jam ie ▁to ▁remain ▁out ▁of ▁prison . ▁Frank ▁and ▁Jam ie ' s ▁wife , ▁Kar en ▁( R eb e cca ▁At