Traveling into dangerous waters

Me and my fiance and his family took a road trip to his moms for his sister birthday.  Nonna's you remember around this time last year we visited them, later I found out I was pregnant and we went that long trip......  Anyway with visiting them this time is was nerv6about the outcome because his sister in law was keeping up mess with saying his si6wanted to fight me...  During this trip I keep to myself for the most part.  I mended the fence with the mom and the sister in law started giving me side eyes.....  It made me wonder if she just keep up mess to get closer to the mom because her and her husband have been having issues.  Any way it's not a competition I'm good weather they love or hate me!!!!!!!