When my sister(35) was 25 she gave birth to my nephew who passed away soon after birth. Until that moment she wanted to name him "Dylan" however after he passed away she named him after our late grandfather "Theodore". As in until my late nephew passed away he was Dylan but after he did he was Theodore (She didn't write a name in the birth certificate, because in our culture we only fill in the name after a ceremony). When she told me what she did, I told her she should change it because my cousins (4 cousins) and I planned to name our children after him, and we all made it clear ages ago that no matter what happens we'll stick to it.
However we all agreed to wait 5 years before naming our future kids Theodore out of respect for my late nephew.
My youngest cousin gave birth 3 months ago, she had a son who she named Theodore. When the rest of my family heard they started yelling at her and calling her names. My sister called me sobbing and calling my youngest cousin every horrible name under the sun. I told her the same thing I said in the title now everyone is also upset at me. The only people in my side are my 4 cousins, but I feel guilty and feel that I could have handled it better. AITA?
Forgot to add: The reason why our grandfather's name is so special for us is that he raised the above mentioned 4 cousins after my aunt and uncle passed away, and me after my family kicked me out when I was 14 because I was gay. He was 70 and basically raised 4 kids and later me till we were adults. My sister was not at all close with Gramps and she didn't even attend his funeral.
Edit: Only one of the kids between the 5 of us id going to be called Theodore.