2 networks,.1 internet connection?

So we have 2 houses on our farm. The first house has the internet/router from the ISP. I've run a.. like 300ft ethernet wire over to house 2. Which goes to a switch then ethernet to each room in house 2, with a wireless router attached, it has its DHCP setting turned off. So everything gets its 192.* IP from the ISP router in house 1.

What I would like to do is have house 2 on its own network but still able to get the internet from house 1. Access from either house to either house isn't necessary but I guess would be ok.

The problem we are having is all of our Google home and smart devices between houses are getting intertwined on the same network so it now makes sense to seperate them if possible.

Thanks!