Stopped doing this years ago
Once you touch something, you own it. Whatever happens later is your fault and you need to fix it. I only work on the immediate family's computer, and with all but my grandmother on the other side of the country, it makes it even better. I'll give advice, tell them what to do, but never touch it.
Now I say I don't work on computers anymore. They say I'll pay you. I say no. Call the idiots at Geek Squad or ask your kid, I'm not touching it. If they get mad, tough shit, not my problem. If they no longer like you because you won't fix their computer, good for them. They're not worth the trouble.