1982 film by Petr Schulhoff

A family purchases a home robot designed to look like a grandmum. Their neighbours immediately buy a more expensivve model as the two families always try to up the other one. Both grandmums start to "terorize" their families because they were set up to ensure the mums exercise, the kids study etc. Apart from that they start causing problems to the other family ... cut ropes with hanging clothes, pierced tires, etc. Once they get to killing each other family's pets the parents get really worried about the safety of their kids. The grannys later destroy each other while fighting and the families decide that they'll be better off without any robots. (It's some time since I saw this so the details may be off.) Mainly thanks to the design of the robots it's rather a comedy than a horror. Unless you are ten. And a rather good comedy!

During an unsuccessful burglary attempt, Jaroslav accidentally kills his old neighbour. His wife, Dana, concocts a plan to make the murder seem like an accident. Another neighbour stands in the way, however, whom they also have to eliminate. Dana convinces Jaroslav to help her. They attempt to use this incident to solve some of their financial problems. With the vision of easy money, the Stodolas start killing elderly people. Initially, they proceed to cover up the murders as accidents or suicide and the police do not do much to prove it otherwise.