Tips? Any idea why?

My almost 7 month old will go around my mom and be fine and not cry. Our daughter HARDLY cries but she is very demanding meaning she will “yell” at us when she wants something 😂 but when we go around my fiancés mom, baby girl will cry and reach for me , she won’t let his mom nor dad hold her for too long unless they have food ..is there a reason she does this ?