Today my grandparents connected to my WiFi, the password was given to them by my partner. Well, after looking at their PC's we established they hired someone who has installed loads of stuff on the computer via remote access, which they accepted on their end when asked to do so.

Looking at the company that did this, they appear to have faked the members using stock images, so at this point alarm bells are ringing.

My question is: what's the likelihood of my devices which were turned on and connected to the internet being compromised at the time that the compromised laptop connected.

The tricky situation is my partner has important information for his business on his computer, so he doesn't want to do a complete wipe which puts us in a tricky situation.

My partner is using a Windows-based computer, I'm using Linux and both of our phones are Android.

At the moment, I am panicking because I don't know what to do. Our home network could be compromised and with my partner refusing to wipe their machine, I'm afraid I could be compromised too.

I keep reading that it's unlikely that a sophisticated hacker would program this for low level targets.

What are your thoughts and what should I do next?