Replies to 'The Meaning of "Family"'

Ok ay so here it goes, i never thought i would need to write about a situtation but i think i just need some support.  

I met my fiance almost 2 years ago, he was getting out of a marriage with a women that he was in an abusive relationship with, she was very verbally abusive.  He was also married at a young age for only a brief period under 2 years for both the marriages and they had only known each other a short period of time.  Granted when i met him i took a step back when he told me this but we started out as friends.  He had no childern from the marriage and we fell in love, he is the most caring man i have ever met and we get along at every level.  He has done some healing and discovering over why he was in such a rush to be married. Soooo after many wonderful months and with the permission of my father he asked for my hand in marriage.... very delighted i accepted and cannot wait to marry him i know with his past it can be scary but i have no doubt in my mind that him and i are meant to be forever. 

Now thats the background, and now is when things have become very stressful for me, I am trying to be the strong one and help him through everything but i am feeling overwelmed.  We received a call from a girl he dated very briefly at 17 years old before he moved away for college.  She is a 12 year old son she suspects my fiance as being the father ...... and to top it all of his brother has kept this from the whole family for 12 years she has been commuicating this with him and he has never mentioned anything to my fiance or his parents .... CRAZY and so now we are going ahead with a paternity test to find out for sure before we make any further moves.  And next his brother is angry at him for a boys/brother incident a week or so ago, mostly just jealousy and competition and now does not want to be fiance's best man .... I see my fiance hurting so bad and i just don't know how to help and yet still be excited for our life together with all of these curveballs being thrown our way..... Is someone trying to tell us something .... 

Thoughts, advice, encouragement .......