Hophni ben's father is Eli ben Ithamar. His paternal grandfather is איתמר. He is an only child.
General Notes
And the two sons of Eli, Hophni and Phinehas, the priests of the LORD, were there. ... Now the sons of Eli were sons of Belial; they knew not t he LORD. Now Eli was very old, and heard all that his sons did unto all Israel; and how they lay with the women Now the sons of Eli were sons of Belial; they knew not the LORD.
Hophni ben Eli