My wedding is a month away (a weekend-long destination wedding). We've been engaged for 14 months and our guest list has been set for almost a year. My younger sister got engaged last week and my mom wants to invite my sister's future in-laws to the wedding. Is that appropriate? I have met them one time and my mom met them for the first time this week. I feel that having them there will take the focus off of our wedding and celebrating our love and relationship and put some of the focus and attention on welcoming my future brother-in-law's family to ours. Shouldn't the focus of the weekend be joining my family to my fiance's family?
Is my concern rational or am I being selfish?