If my mother recently died and I was on her bank account with her, can my siblings sue me to get her money?

Question Details: My grandmother legally adopted me when I was born from my mother (her daughter). My mom/grandmother and I had a joint bank account (it is now individual since she has passed away last month). My aunts/uncles (her children) are threatening to sue me for her money. She had no Will, etc. Amount she had was 35K. With burial expenses and bills it is now 19K. Are they able to sue me even though it was joint with rights of survivorship? What do I do?

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