My siblings insist their kids deserve a share of our mother’s $440,000 estate

Dear Quentin,

We are three siblings: my brother, my sister and I. Our mom passed away from a stroke in Arizona. Her estate went to probate court as she had no will. We were all on the same page and had no issues getting everything done. Her house was sold very quickly for $420,000. There was $20,000 left in her bank account after paying off her credit cards. 

I…