savage swan nicknamed asbaby attacked punters on the backs area of river cam in cambridge over easter .
mr asbo , the swan believed to be his grandfather , was moved away in 2012 after repeatedly attacking rowers .
asbaby seen getting close to tourists , eating sandwiches , drinking from bottles and trying to steal handbag .
swan , which still has many brown baby feathers , said to be son of asboy - which has also terrorised punters .