Torah order

15 Aliya Order Family Members Called Up to the Torah A father and a son may not be called to the Torah one after the other. Similarly, two brothers should not be called to the Torah one after another. Once they have already been called, depending on the circumstances, sometimes they will have to go get the Aliya or stay up on the Bima. The main reason for not allowing two close family members to get subsequent Aliyos is AyinHoro, not to cause any evil eye to chasveSholom befall them. Some people are also careful with a father and a grandchild, particularly if it is a son’s son. Some people are even particular with a father and a son-in-law, although strictly speaking, these cases are not included. They may be called to the Torah, and certainly if they were called, they should get up and go get the Aliya.

https://halacha2go.com?number=15

Practical Halacha: One minute a day. By Horav Yosef Yeshaya Braun, shlita, Mara D'asra and member of the Badatz of Crown Heights.