@McFox Why do you want DHCP to assign you the same IP every time?

@ShuzoKOYAMA What do yu mean by "loss of connection"? Why have you added "ipv6" as a tag?

@Hasayeret To answer the title of your post, no you can't afaik Multiple pack Decos work as a "set". In your case, you can either add both of them either to your network, or your parents' network. Or...

@JonSong Are you connected to the Deco (via Wi-Fi) when you're trying to log in to the Deco app?

@AngryAsianGuy Apparently they've faced some issues in 1.7.0 beta firmware, which is why there's no stable release yet (after 8+ months)

@dunsandle Try running the Decos in access point mode