Katherine Jackson put some of her grand-kids out of the house.  TMZ has learned … Katherine Jackson is downsizing the number of grandchildren in her San Fernando Valley mansion — and the stun gun incident was the catalyst.

Sources with direct knowledge of the situation tell TMZ …  Katherine has told Alejandra Genevieve Oaziaza — who is currently living at the estate, along with two of her kids by Randy Jackson and two others by Jermaine Jackson — that she must take the kids and move out of the estate next week, because supervising seven children is just too much for the 79-year-old grandmother.  Don’t think Katherine is heartless.  It’s the opposite.  She’s moving Alejandra, along with Jaafar, Jermajesty, Donte and Randy Jr. to a San Fernando Valley condo owned by the estate.  So as of next week, Prince, Paris and Blanket will have the run of the mansion.