I can offer some general possibilities for why your mom may be visiting your brother's house at night:
Family bonding: Your mom may enjoy spending time with your brother and his family in the evenings, which could be a way for them to bond and maintain close family ties.
Support and companionship: If your brother lives alone or has a busy schedule, your mom may visit him in the evenings to provide support or simply to keep each other company.
Assistance with household tasks: It's possible that your mom helps your brother with certain tasks or chores, such as cooking, babysitting, or other responsibilities.
Special occasions or celebrations: Your mom might visit your brother's house at night to celebrate birthdays, holidays, or other special events with the family.
Proximity: If your mom and brother live close to each other, it might be convenient for her to visit him in the evenings.
Cultural or family traditions: In some cultures or families, it's common for family members to spend time together regularly, including evening visits.
Emotional support: Your brother or someone in his household might be going through a challenging time, and your mom could be providing emotional support and comfort.
If you're curious about the specific reasons why your mom visits your brother's house at night, the best approach is to have an open and honest conversation with her. Express your curiosity and ask her directly about the reasons for her visits. This will not only provide you with answers but also show that you're interested in her life and family dynamics. Remember that every family is unique, and there could be a variety of reasons specific to your family's situation.