<human>: Give me the gist of the text in a nutshell

So my boyfriend and I are moving in together come January, we have been planning for the past 4 months.  We are using this time to pay off debts and save.  Now this would be my first time moving out of my house (besides college which was 1 semester).  I have been excited and enthusiastic about this move.  Now the issue...

His brother, a year younger than him, is going through some issues with himself and wife, as of yesterday he might end up losing his job and face homelessness and divorce.  My SO was stressed out about this and came to the conclusion that he will stay on the couch of our home until he can put himself together.  I am for helping family, but honestly I am moving out of my mothers home for freedom, to not pick up after countless of people and to be able to come home, not feel pressure and relax.  I dont think it is suitable for a couple whom will be living together for the first time have to take on another person.  I know it takes about a year to adjust to a persons living habits and I dont want to ruin this special time for ourselves to take someone else in.  I wouldnt have an issue with it if him and I have been living together for sometime and his brother needing help after we had adjusted.

I dont know how to approach this subject to him without seeming unsympathetic, or unreasonable.  I feel if I tell him, he will feel as if I am giving him an ultimatum, and added stress onto an already unfortunate situation.  Should I just let them two live together and wait until it is my time with him, or should we stick to our original plans to move in sans brother?

I would appreciate any advice on how to bring this up please.
<bot>: bf and I moving in together for the first time ever, but he wants to bring in his brother who is going through hard times.