To feel my sil has insulted my child

[BlueParrott]

Grrrrrr. I'm so angry. Last night we went to my future pil to celebrate our engagement. My son came along too. My fiancée was playing with my son and my son was trying to say dada. My future sil was there and she said my son shouldn't call her brother dad as he's obviously not his dad and he'll be confused when he grows up. For reference my son is mixed race and my fiancée is white so yes it is obvious he's not his dad but why say it?

My fiancée told her to shut up and his parents looked shocked. Anyway the night went on and all was fine. Aibu to feel she's insulted my child?

[Blu]

"I do think what is important for your forthcoming marriage is a lot of clarity about your fiance's role in your son's life. Is he planning to take on a life-long parental role?"

I imagined the OP had decided to get married and live with a man who would never involve the child in any wider family engagements (except obviously the engagement celebration, as a one-off, and grudgingly, because the OP couldn't find a babysitter), never buy him a Christmas present, or play with him, and then send him to a hostel aged 16. Because that is what the OP would be looking for in a husband, isn't it?

[FluffyEwok]

I wasnt saying the sil is right before im pounced on! Shes obvs not happy with op due to several issues including her relationship with brother and the fact op slept with a man she was interested in.