Hello! I want to set up a pi-hole on my home and connect from my parent’s. Both setups have a dynamic IP assigned by my isp and are different networks.

I have a couple of questions:

1. I can get a domain that updates automatically. But how would I resolve it on the client side?
2. Is there any way to authenticate on the server? By Mac maybe? That can be spoofed right?

Edit: my bad, thanks for correcting me, Mac is another layer completely

3. Can setting up a VPN solve both (1) and (2)?
4. Is there any other way?

Thanks!