Who is Kitty and Gloria Pommeroy from Stern Men and what is their importance?

Rhonda Pommeroy's elder sisters, Kitty and Gloria both drink, but Kitty regularly becomes fall-down drunk. When she hears something funny, she sinks to her knees and, when helped up, makes lady-like motions to cover her mouth and fix her hair. Gloria, the eldest, has a heavy, unhappy face. She never marries. In her youth Kitty works off-island and has numerous lovers. Abortions leave her unable to have a baby.