She is Jonathan's sister and Jake and Hayley's paternal aunt. Like her brother, she is unaware that her sister-in-law and niece and nephew are from a long line of dragons, but she is in a relationship with a Sewer Troll named Stan Lipkowski. Not much else is known about her.
Patchouli is the only known Paternal relative of Jake's that is seen in the series (though his paternal grandfather is mentioned in Season 2.)
Promotional artwork of Aunt Patchouli aka Aunt Patty