Yikes MM

I think this is really going to test your ability to cope and use boundaries. Can you and her sit done first thing and just make a game plan / rules etc that you are both going to really need to follow so that there isn't a blow out and your stability goes to hell.

Yeah the germ thing , so can relate.. It will probably take time for her son to get use to using it .. Maybe buy one to start with that has a good action figure kid friendly bottle to encourage him to use it.

I hope there is a way to blend them into your home with as little uproar as possible.