Chrissie Jackson Chrissie Jackson was the ex - wife of Alan Jackson and the mother of Maria Jackson . Chrissie and Alan divorced not long before Alan and Maria moved to Bannerman Road , and despite the separation , Chrissie continued to take an active role in Maria ' s life , often stopping by Alan ' s house unannounced . ( TV : " Invasion of the Bane " ) Chrissie was involved in a relationship with a man named Ivan , which led to friction with Maria , who accused Chrissie of walking out on her family . This friction reached a head when Chrissie briefly moved back in with Alan and Maria during a brief estrangement with Ivan . ( TV : " Eye of the Gorgon " ) Chrissie expressed a mixture of distrust and jealousy over Maria and Alan ' s relationship with their neighbour , Sarah Jane Smith . Her instinct appeared to be confirmed when Sarah Jane was suspected of kidnapping her adopted son , Luke , from another family , and it was Chrissie who notified the police . ( TV : " The Lost Boy " ) She defeated Kaagh by swinging the heel of her high heel into his probic vent . However , as a side effect , she was electrocuted and temporarily knocked unconscious . Maria gave her gas , developed by Luke , to knock her out , making her supposedly forget about aliens . However , she later revealed that she remembered everything , but she didn ' t tell Maria or Alan as she thought they deserved a fresh start . The only one who knew this was Sarah Jane . ( TV : " The Last Sontaran " ) Chrissie and Ivan planned to marry . Alan , Maria , Luke , Clyde and Sarah Jane were invited to their wedding . Maria and Alan wanted to come to the wedding and wished to see their friends from Ealing there again . ( TV : " The Day of the Clown " ) Chrissie and Ivan planned to come to Washington DC during their honeymoon . Chrissie wanted Maria to show her all the best shoe shops in the capital . ( PROSE : " The Last Sontaran " ) Andrea Yates ' world . Timeline 1 . In an alternate timeline created by the Trickster , in which Sarah Jane died in 1964 , Andrea Yates saw Ivan snogging Lorraine Groom outside the Conservative Club and told Chrissie Jackson about it . Chrissie Jackson dumped Ivan because of this . Chrissie needed money so she started to work at a supermarket and even wear a supermarket uniform . Maria thought it looked odd on her . Chrissie later met Ricardo and dated him . Maria Jackson had already met Ricardo plenty of times . ( PROSE : " Whatever Happened to Sarah Jane ? " ) Timeline 2 . In the alternate timeline created by the Trickster , in which Sarah Jane died in 1964 and Maria was also taken out of time and space , Chrissie and Alan still divorced but Chrissie had no memory of ever having a child . Despite this and their divorce , she and Alan were still close and had a mutual friend in Andrea Yates , the neighbour who replaced Sarah Jane in the timeline . ( TV : " Whatever Happened to Sarah Jane ? " ) Personality . Chrissie ' s personality tended to be brash and rude at times , although she exhibited tenderness towards her daughter and continued affection for her ex - husband . ( TV : " Eye of the Gorgon " , TV : " Whatever Happened to Sarah Jane ? " , TV : " The Lost Boy " ) She also expressed continued scepticism about the existence of alien life , despite worldwide events and her own face - to - face encounter with a Graske . ( TV : " Whatever Happened to Sarah Jane ? " ) She also took the news that aliens existed and her daughter fought them much better than her ex - husband . Chrissie was also unafraid of danger , as she willingly rushed off to find Maria when she was fighting the Sontaran Kaagh , and immediately charged into the fray upon seeing him threatening Maria ' s life . Chrissie was also a lot cleverer than she looked , as she was able to remember the sole weakness Sontarans had despite having only heard it for a few seconds and strike it with pinpoint accuracy ( TV : " The Last Sontaran " ) . She had a tendency of calling Sarah Jane a number of different names , such as " Mary Jane " , ( TV : " Eye of the Gorgon " , " The Last Sontaran " ) " Bobby Sue " , ( TV : Whatever Happened to Sarah Jane ) " Sally Jane " , ( TV : " Eye of the Gorgon " ) " Sally Anne " , ( TV : " Revenge of the Slitheen " ) " Contrary Jane " ( TV : " The Lost Boy " ) and " Calamity Jane " . ( TV : " The Lost Boy " , " The Last Sontaran " )