Microsoft is suing three people from Vancouver whom have committed click fraud by improperly manipulating Microsoft’s online advertising.

The three defendants are a family consisting of two brothers and a mother. The brothers Eric and Gordon Lam and the mother Melanie Suen made more than $250,000 in profits. However, Gordon Lam denies the existence of any lawsuit with Microsoft.

Representatives from Microsoft commented that since last year they’ve being monitoring the waves of fraudulent clicks on advertisements. They found out about the Lam brothers and his mother after a long search that lead them back to the family as the main source of the fraud, allegedly.