How does it look on someone who is going through a divorce to stay with their boyfriend with their baby because they have no where else to live?

We have a wide variety of judges in Alabama and they have very different opinions on this subject.  The law is supposed to be impartial, but that goal suffers when very personal problems are placed into the hands of fallable humans to decide.  This situation matters more to some judges than to others.  I assume that there is a divorce case pending.  If so, your sister should ask her lawyer for advice.  I can tell you what the standard answer to this question is, and that is this:  No, it is not a good idea for you to move in with your boyfriend while you have a  divorce case pending, and what are you doing with a boytfriend, anyway?  You should not be dating, let alone have a boyfriend, until the divorce is final. WARNING:  I am not your lawyer and providing you with the generic information, definition, clarification or explanation you seek about a legal matter on this anonymous forum does not make me your lawyer.  By answering your question I am only trying to provide you with general information that will deepen your understanding of the legal concept that appears to be an issue for you, that will hopefully guide you in selecting and communicating with a lawyer of your choosing.  The reason for all this is that legal problems are intensely fact-driven, and it is impossible to give anyone correct legal advice without comprehensive inquiry by the lawyer into the specific facts of the situation that concerns you, and the law of the jurisdiction in which you reside, and that is impossible to accomplish through this website.  Even though I am not your lawyer, if I should later become your lawyer no representation is made that the quality of the legal services to be performed is greater than the quality of legal services performed by other lawyers.