His sons used to hold feasts in their homes on their birthdays, and they would invite their three sisters to eat and drink with them.
NIV
His sons used to go and feast in the house of each on his day (birthday) in turn, and they invited their three sisters to eat and drink with them. [Gen. 21:8; 40:20.]AMP
And his sons went and feasted in their houses, every one his day; and sent and called for their three sisters to eat and to drink with them.
KJV