Albert Barnes Commentary 2 Samuel 6:3

"And they set the ark of God upon a new cart, and brought it out of the house of Abinadab that was in the hill: and Uzzah and Ahio, the sons of Abinadab, drove the new cart." — 2 Samuel 6:3 (ASV)

The house of Abinadab in Gibeah—rather, on the hill (as in the margin and 1 Samuel 7:1). It does not at all follow that Abinadab was still alive, nor can we conclude from Uzzah and Ahio being called sons of Abinadab that they were literally his children. They may well have been sons of Eleazar and grandsons of Abinadab, or even more remote descendants, since there is no distinct evidence that Abinadab was alive when the ark was brought to Kiriath-jearim. The house may have retained the name of “the house of Abinadab” long after his death.