Is a will still valid if one of the children names is listed as a nickname

My mother passed away and we were informed she had a will. The will name my sister and brother as Executors, leaving everything to my sister. As it list 5 siblings, my name was listed as a nickname. The will stated all funeral expenses are to be paid and then went into real & personal property. An attorney was retained by my sister. However my mom is blind and had the will read to her in front of witnesses and lead to believe she signed it. When the will was read, the attorney stated I was sole beneficiary and her wishes for me to pay all her bills. My sister learned I was the beneficiary from the funeral home & the will did not name a beneficiary. My sister and brother, both named executors have harassed and threaten me to turn over the monies received as it was intended for them. Thru discovery we learned they robbed my moms bank accounts and attempting to collect claiming out-of-pocket expenses. Can someone pls. Help me with this.