The Zukernick family marries twice into the Karelitz family, as illustrated in the chart below. One is in the "D" branch, one in the "A" branch, but both were from the Haverhill area.
Chaya Zukernick marries Mordechai Chaim Karelitz (D2). Chaya's brother's daughter, Lena Zukernick, marries Morris Wolf Karelitz (A91).