Dad's sister messaging me

So I got a message last month from my dad's sister who I haven't talked to in many years and she asked me for mine and my sisters information because my dad's mom was updating her will and I just ignored the message and deleted it because I don't like my dad's side of the family so I didn't care. The main reason I don't like them is because when my dad was dying we had called them and all they said was when he die's let us know and that was it.. I think that was absolutely disgusting behaviour from them because even though my dad was an alcoholic he didn't deserve that from his own mother and siblings so I have not kept in contact with them at all (that was 5 years ago) and never plan on talking to them again because of it. Well today I told my mom and sister about them messaging me and they got upset I didn't give them information on me and my sister when they requested it and said you probably screwed us out of money from her.. I was shocked they were actually mad at me because I didn't respond to them. They knew how they acted towards me and my sister when we were young not to mention what they did towards my dad when he was dying and they didn't care. Not to mention the stuff my dad's mother said about my oldest son because he was African American and white mixed because she's a racist! I don't care about any of them or their money! That seems to be all my mom and sister care about is money and it really upsets me that they got mad at me over that. Was I in the wrong for not responding?

Just an FYI they had sent a message to my sister as well and after I told my mom and sister about it she said that my dad's sister did send her a message and she didn't see it til I said something. It's not my fault my sister never answers her messages! It's not my responsibility to keep up with her crap!