“Would Yisrael, who was first-born after conversion, be considered my bechor, then?” asked Avraham. “Should he be getting a double portion?”
“No,” replied Rabbi Dayan. “If a man had children before conversion his subsequent children do not have the status of bechor [C.M. 277:9]. However, if you want Yitzchak to share the estate, you should prepare an explicit will and attach the appropriate documents to make the will halachically valid. You can contact my office for help in procuring the appropriate forms.”
“Will do,” said Avraham, thanking Rabbi Dayan.