What should I do.

Hi mummies , my inlaw house is infested with bedbugs and insects and due to poor mantaince of the house as well as circulation. Everybody in the house knows about it. I don't even know how do they live with it in the house .. Even my husband , but they are not like taking action about it. I feel this is a serious matter as back then I had this problem at my mum place but thankfully all cleared up . Bedbug suck human blood and is very hard to kill and multiple very fast . Always worried that my child will get bitten or we'll bring back to our own house and spread to our house . This make me reluctant to go to their place during the weekends ... I've tried communicating but nothing is solved.. What should I do ?