We already had it with the Obuma couple.
Maybe they adopted Mack who was Father Mack & Gillibrand's love child.
Johnathan Mack, Allison Mack's father is an American who is an opera singer, and was living and performing in Germany.
I propose that Gillibrand also living in Germany then, had an affair with married Johnathan Mack
and Johnathan and his wife at the time adopted Allison, the love child.