Matthew Poole and continuators on Genesis 37:35

35 And all his sons, and all his daughters rose up to comfort him: but he refused to be comforted: and he said, For I will go down into the grave unto my son mourning: thus his father wept for him.

Dinah, and his daughters in law, and his sons daughters.

This Hebrew word Sheol is taken sometimes for hell, as Iob 11. 8. Prov. 15. 11. but most commonly for the grave. Or the place or state of the dead as Gen. 42. 38. and 44. 29, 31. Psal. 6. 5. and 16. 10. &c. And whether of those it signifies, must be determined by the subject and the circumstances of the place; here it cannot be meant of Hell, for Iacob neither could believe that good Ioseph was there, nor would have resolved to go thither, but the sense is, I will kill my self with grief, or I will never leave mourning till I dye.

Or, For my Son: so the preposition El is oft used for Al, as 1 Sam. 1. 27. and 4. 19, 21, 22, and 2 Sam. 21. 2.