Albert Barnes on Luke 15:29

A kid. A young goat. This was of less value than the calf; and he complains that while his father had never given him a thing of so little value as a kid, he had now given his other son the fatted calf.

Make merry with. Entertain them--give them a feast. This complaint was unreasonable, for his father had divided his property, and he might have had his portion, and his father had uniformly treated him with kindness. But it serves to illustrate the conduct of the scribes and Pharisees, and the folly of their complaint.

(v) "do I serve thee" Is 65:5, Lk 18:11 (w) "neither transgressed I" Phi 3:6