Moving close to my sister?

First of all you are having your own child and starting a family and she needs to know that you are not gonna be available all the time to help her out. You can not expect your fiance not to be up-set because you are canceling your plans to suit someone else. Stop putting your sister before you put the man you want to marry If you want a life together. She is selfless and don't care about what you have plan sure i would let her no and stop spending so much time over there. Best of luck