He considers Levi and Lissa to be his uncle and aunt since his Aunt Natasha is so close to them like siblings. He considers their children and adoptive children to be his cousins.

.
Levi Ackerman

.
Lissa Ackerman

.
Eric Ackerman

.
Kuchel Ackerman

.
Iris Ackerman

.
Farlan Ackerman

.
Isabel Ackerman

.
Erwin Ackerman

.
Adeline Ackerman

.
Scott Meyer

.
Wynn Meyer

.
Perry Meyer {left}

.
Terry Meyer {right}

.
Nathaniel Meyer

.
Jonah "Dove" Meyer

.
Angel Meyer

Note: Iris and Adeline belong to SpamChan.