Here's a rough draft if you are interested:
Blessing of the Wailing Mother. The initiation process into the Screaming Sisters requires a ritual that permanently deafens her. Her brain and soul are changed making her immune to verbal charms and resistant to thunder and psychic damage.
Observant. If you can see a creature's mouth while it is speaking a language you understand, you can interpret what it's saying by reading its lips
Fey Ancestry: You have advantage on Saving Throws against being Charmed, and magic can’t put you to sleep.
Language of the Wail: Screaming Sisters can communicate with each other using hand signals and air currents if they can see each other.
Innate Spellcasting: Screaming Sisters are a 6th-level spellcaster that uses Charisma as their spellcasting ability (spell save DC 15; +5 to hit with spell attacks).She can innately cast the following Spells, requiring no material components:
At Will: Message, Fog Cloud, Ghost Arrow (see below)
3/day each: Snare, Shatter (15’ cone), Inflict Wounds
1/day each: Blink
Chorus of the Dead: Each Screaming Sister has a 5' aura around her. If a Banshee uses her Wail ability, anyone within the aura is affected by it (not just those within 30' of the Banshee)
ACTIONS
Short Sword. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d6+3) piercing damage.
Ghost Arrow. Ranged Spell Attack: +5 to hit, range 120 ft, one target. Hit: 9 (2d8) necrotic damage and the target can’t heal for one round.
Curse of the Banshee. Ranged Spell , 60’ range, The target takes 2d8 poison damage and it's poisoned until the end of your next turn. Constitution save (DC 15) negates.
Gift of the Banshee: Screaming sisters can cast Inflict Wounds and Shatter once per day as a bonus action. This counts against their innate spell casting limit.