No static IPs for residential cusomters but they are fairly static if you are not offline for too long. 24hrs I think. With Rogers or Teksavvt my IP would only charge once or twice a year. A chnage in MAC addrss will also grab a different IP.
As for a 2nd IP, you will be assigned up to two at the same time.
I just quickly scanned through the thread and to me it sounds like port contention, (you are both fighting to get through the same door).
It's not a modem or bandwidth issue (not unless someone is saturating your line at the same time).
I have an XB1 as well but I've never had another in the house, interesting probelm you have. I personally can't stand PnP, there has to be a better way.
How much control do you have over the modem in the house, how close are you and your brother? I want to come up with a solution as I find this situation interesting.
Gotta put the kids to bed, I'll give this some thought and get back to you.
Does anyone here get latency spikes on League of Legends here? I use to play on that sweet 28 ping but now its around 50+ and sometimes goes past 100 which is quite unfortunate.
So without giving it too much thought, here are some quick and dirty ideas;