Grandparents

My stepson came to me crying and saying that hes not allowed to call my mom grandma Linda because his mom told him hes not allowed to. My fiancé have a daughter together (almost one) and his son (5) I've been in his life since he was 2 and we're getting married in September. My bio child is at the point where she is now talking and has named my mom "Nana" which is what my step son calls his mom's mother. So he has called her grandma Linda when we hang out with her or go to my family events or talk about her etc. This is something he has chosen to do. He doesn't call me mom, I dont want him to call me mom non of that kinda stuff. His mom's dad is homeless and struggles with addiction and her mom has substance abuse issues but is around despite his mom growing up in foster care. My fiancé's mom is around and they are polish so we call her babciá for both kids. His dad unfortunately passed so my parents are the only intact grandparent couple essentially and they have taken to him and love him just as they love our daughter.

Last weekend was my mom's birthday and we baked her a cake together and im assuming SS was excited from the party and baking and shared with his mom that it was grandma Linda's birthday and all the fun he had and baby mama crashed out. She told my SS that my parents aren't his grandparents and that hes not allowed to call them such.

SS his dad and I have already explained to him multiple times that no my family is not his blood relatives and that they are his sisters blood but that we all love him just the same. SS was very happy to have another "grandma" and another "grandpa" as my fiancé's dad's death was hard on everyone and he was the rock of the family.

BM messaged fiancé telling him SS isn't allowed to call them his grandparents and need to call them their first names only to which made him really sad to the point that he had told his dad and I both separately that hes sad hes not allowed to have grandparents.

Fiancé didn't take the bait and essentially told her oh well. I tried having a conversation with her to explain that we're not asking him to call them that at all or over step in any way its just what he would like and that we all love him.

BM claimed emotional damage to her kid and said we're out of line and not allowed and that shes taking us to court over it. Today is pickup day and she has since called the cops and said we're harassing her and that she feels unsafe and now the cops are going to escort her to pick him up because shes pregnant and we're a "hostile" environment. No threats or antrhing like that were ever present all I had said to her was im going to allow him to call them what he would like and that I'm not catering to her dictating and setting parameters for our grandparents time.

She messaged my fiancé's mom and said she was being harassed also.

She told us not to message her unless its an emergency and threatened us with court separately.

Am I crazy? Are pregnancy hormones kicking her a$$?

It just seems like its a lot to kill a little kids happiness and an old persons happiness just because her pride is hurt that she doesn't have parents.

Shes remarried and pregnant with her husband so I just dont understand the drama. Shes been kinda funny since we got pregnant with our daughter anyway.

If nothing else thanks for reading my rant